FlexRadio FLEX-8400M firmware — latest version 4.3.16 (Oct 13, 2026) — Ham radio

Version 4.3.16 Latest Released Oct 13, 2026 First seen Oct 14, 2026

Adds AutoDX CW pile-up assistant, Auto AGC-T, a DSP Controls panel and a Noise Floor Range setting; deletes Maestro/M DVK F-key memories. — summary by updatemystuff.com

Source: flexradio.com

Show release notes

Page 1 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.3.16 Release Notes | SmartSDR+ v4.3.16 Release Notes Version Release Date Release Theme/Title 4.3.16 2026-10-13 AutoDX, Auto AGC-T, DSP Controls - Advanced and Noise Floor Range Adjustment SmartSDR Basic™ and SmartSDR+™ v4.3.16 is an Early Access software and firmware release for Aurora™, FLEX-8000™, and FLEX-6000™ series SDRs, as well as Maestro™.

This version supersedes all previous SmartSDR releases and is available to all users.

Access to new features introduced in this release is limited to SmartSDR+ Early Access feature license holders unless otherwise noted.

Important Release Information Before upgrading, please review all sections marked as IMPORTANT for upgrade prerequisites and other critical information.

There are multiple important notices associated with SmartSDR v4.3.16.

You should understand these changes before upgrading from a previous version of SmartSDR.

Please open a HelpDesk support ticket if you have questions.

Important Notice: SmartSDR v4.2.18 introduced a new software architecture with updated DAX and FlexVSP drivers.

Leaving older versions on your PC may cause installation conflicts or degraded performance.

If you are running SmartSDR v4.1.5 or earlier, we strongly recommend completely uninstalling all previous versions of SmartSDR, including the DAX and FlexVSP drivers, before upgrading to SmartSDR v4.3.16.

If you are running v4.2.18 or later, you can skip this notice.

For detailed uninstall and installation instructions, see the HelpDesk article "How to Install SmartSDR v4.2.18." When following those steps, substitute v4.3.16 for v4.2.18.

Important Notice: The DVK Function Key memories in Maestro/M will be deleted as part of the v4.3.16 upgrade, due to resolving several problems in the v4.2 code that have since been fixed.

Migration would have carried the problems forward.

New v4.3.16 Features at a Glance Feature Needed Feature License Supported Radio Models AutoDX (ADX) SmartSDR+ (Early Access) FLEX-8000 Series, Aurora Auto AGC-T SmartSDR+ (Early Access) FLEX-6000 Series, FLEX-8000 Series, Aurora Expanded DSP Algorithm Controls SmartSDR+ (advanced parameters) Basic (on/off and level settings) All models (NRF, NRS, and RNN: FLEX-8000 Series and Aurora only) Noise Floor Range SmartSDR+ FLEX-8000 Series, Aurora CW Profiles SmartSDR Basic FLEX-6000 Series, FLEX-8000 Series, Aurora PTT Override SmartSDR Basic FLEX-6000 Series, FLEX-8000 Series, Aurora Toggle Breakin F-Key SmartSDR Basic M-Models and radios connected to a Maestro NTP Time Sources SmartSDR Basic FLEX-8000 Series, Aurora Confirm Exit (CAT and DAX) SmartSDR Basic All models (SmartSDR CAT and DAX) Page 2 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.3.16 Release Notes | SmartSDR+ v4.3.16 New SmartSDR+ and Basic Features: As noted below, radios licensed for SmartSDR+ will gain access to the new SmartSDR+ features approximately 30 days after this Early Access release, with a follow-up release of SmartSDR v4.3.

Feature Description AutoDX (ADX) SmartSDR+ Early Access.

FLEX-8000 Series and Aurora radios AutoDX decodes received CW to on-screen text and can automatically work a split pile-up on your behalf.

Enter the DX callsign and your exchange, and AutoDX listens for the DX station, calls when it hears the selected trigger, sends your exchange when the DX station comes back to you, and counts the completed QSO.

Decoded traffic stays on screen, and keying the paddle or CWX hands control back to you instantly.

Requires two CW Slices on different frequencies (one TX enabled) and a callsign set on the radio.
Adjustable TX delay, reply delay, call attempts, give-up timer, and automatic restart.
Built-in CW decoder with WPM, SNR, and lock indication, usable with or without AutoDX enabled.
Available in SmartSDR for Windows (ADX window) and on Maestro and M-Models (AUTODX panel and Toggle AutoDX F-Key).

Operating Instructions: How to Use the AutoDX (ADX) Feature Auto AGC-T SmartSDR+ Early Access.

FLEX-6000 Series, FLEX-8000 Series, and Aurora radios.

Auto AGC-T sets the AGC Threshold for each Slice automatically from a long-term measurement of the adjacent noise floor, keeping the threshold well set as you change bands and antennas and as band conditions change.

It ignores short-term transients such as lightning crashes.

Auto AGC-T is off by default and is enabled per Slice; adjusting AGC-T by hand returns the Slice to manual control.

Operating Instructions: How to Use the Auto AGC-T Feature Expanded DSP Algorithm Controls Advanced parameters: SmartSDR+.

All models except where noted.

On/off and levels: SmartSDR Basic.

The noise mitigation algorithms now have a dedicated DSP Controls Panel, opened from the Slice menu.

The panel provides an on/off button and a level slider for most of them.

An Advanced menu adds per-algorithm parameters (such as delay, window, taps, leakage, and tone thresholds) for NR, NRL, NRF, ANF, ANFL, and ANFT.

The panel shows only the algorithms that apply to the current mode, and Reset All returns parameters to their defaults.

Radios that received the v4.0.1 algorithms also receive these controls, including radios whose SmartSDR+ license has since expired.

FLEX-8000 Series and Aurora radios.

Noise Floor Range enhances Relative Noise Floor Scaling by setting how far the measured noise floor may move before the Panadapter repositions, from 0 to 10 dB in 0.5 dB steps (default 1.5 dB).

Increasing the range reduces the display oscillation that can occur at high zoom levels.

The setting is in the Display menu and applies to all Panadapters.

Radios that received Relative Noise Floor Scaling in v4.0.1 also receive this feature.

Operating Instructions: How to Set Noise Floor Range CW Profiles SmartSDR Basic.

FLEX-6000 Series, FLEX-8000 Series, and Aurora radios.

A new CW profile type joins the Global, Transmit, and Microphone profiles.

CW profiles store keyer settings (pitch, speed, iambic mode, paddle swap, break-in, and more), sidetone settings, and CWX settings including macros.

Profiles can be created, loaded, switched from the TX panel or TX menu, auto-saved, and imported or exported.

Operating Instructions: How to Use CW Profiles PTT Override SmartSDR Basic.

All models.

PTT Override selects which audio source a hardware PTT (RCA or footswitch, ACC, or mic jack) puts on the air.

When enabled, hardware PTT transmits the last used analog mic input even while DAX or remote TX audio is selected.

Behavior change: Before v4.3, hardware PTT always switched to the analog mic input. PTT Override is now disabled by default, so hardware PTT transmits the selected source. Enable PTT Override to restore the earlier behavior.

Operating Instructions: How to Set PTT Override Toggle Breakin F-Key SmartSDR Basic.

M-Models and any radio connected to a Maestro.

A new Toggle Breakin F-Key action turns CW Breakin on and off with one key press.

The F-Key LED follows the Breakin state.

Operating Instructions: How to Assign the Toggle Breakin F-Key NTP Time Sources SmartSDR Basic.

FLEX-8000 Series and Aurora radios; configured from SmartSDR for Windows.

A new NTP tab in Radio Setup lets you configure up to 10 NTP servers, pools, or peers for the radio clock, mark preferred sources, and monitor each source’s status, stratum, and reachability.

The radio ships with a default Debian NTP pool, which is re-created automatically if no sources are configured.

When a GPSDO is installed and delivering time, it takes priority, and the NTP sources act as a fallback.

Operating Instructions: How to Configure NTP Time Sources Confirm Exit for SmartSDR CAT and DAX SmartSDR Basic.

SmartSDR CAT and SmartSDR DAX.

A Confirm Exit setting in the CAT and DAX Settings menus makes the close confirmation dialog optional.

It is on by default, so existing behavior is unchan

Release notes & download

Version 4.2.20 Released Jun 3, 2026 First seen Sep 6, 2026

Activates SmartSDR+ features including band plans, customizable RX filters, and DAXv2 low-latency audio. — summary by updatemystuff.com

Source: flexradio.com

Show release notes

Page 1 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.20 Release Notes | SmartSDR+ v4.2.20 Release Notes Version Release Date Release Theme/Title 4.2.20 2026-06-03 v4.2 new feature access for SmartSDR+ licensed radios.

SmartSDR Basic™ and SmartSDR+™ v4.2.20 is a SmartSDR+ Feature Access software and firmware release for Aurora™, FLEX-8000™, and FLEX-6000™ series SDRs, as well as Maestro™.

This version supersedes all previous SmartSDR releases and is available to all users.

Access to new features in this release is available to all SmartSDR+ feature license holders.

Important Release Information Before upgrading, please review all sections marked as IMPORTANT for upgrade prerequisites and other critical information.

There are multiple important notices associated with SmartSDR v4.2.20.

You should understand these changes before upgrading from a previous version of SmartSDR.

Please open a HelpDesk support ticket if you have questions.

Important Notice: If you are not running SmartSDR v4.2.18, it is highly recommended to uninstall all previous versions of SmartSDR before upgrading to SmartSDR v4.2.20.

If you are running SmartSDR v4.2.18, skip this notice.

Before installing SmartSDR v4.2.20, it is strongly recommended that all previous versions of SmartSDR be completely uninstalled from your PC, including DAX and the FlexVSP driver.

SmartSDR v4.2.18 introduces a new software architecture that includes updated DAX and FlexVSP drivers.

Retaining older versions on your system may result in installation conflicts or degraded performance.

For best results, ensure all earlier SmartSDR versions (v4.1.5 and below) are fully removed before proceeding with the installation.

Refer to the HelpDesk article “How to Install SmartSDR v4.2.18” for detailed uninstallation and installation instructions.

Just bear in mind that you will be substituting v4.2.20 for v4.2.18 Important Notice: SmartSDR v4.2.20 is a Feature Access Release.

This version of SmartSDR activates the new features included in SmartSDR v4.2.18 for all radios that have a SmartSDR+ Feature license installed.

It also contains bug fixes; it is recommended that all users upgrade to SmartSDR v4.2.20.

For information regarding the new features introduced in SmartSDR v4.2.18, please refer to the SmartSDR v4.2.18 Release Notes.

Remember is it's “best practice” to read the SmartSDR Release Notes before installing a new version.

Important Notice: Upgraded DAX to a completely new audio transfer architecture.

Starting with SmartSDR v4.2.18, the DAX functionality has been completely re-architected and is now called DAXv2.

This update delivers significant architectural improvements, enhanced low-latency performance, and improved compatibility and stability with modern Windows systems.

DAXv2 is available for all users.

In addition, DAXv2 is available as a native x64 and ARM application.

The new DAX driver no longer relies on deferred procedure calls (DPCs) for transferring audio data from the radio to PC applications.

For a complete listing of changes, refer to the HelpDesk article DAX Version 2 - Improvements and Updates.

Important Notice: SmartSDR for Windows utilizes a Microsoft Installer (MSI)–based installation package.

Upgrading to an MSI installer architecture provides a standardized installation environment that can automatically detect and repair missing/corrupted components (“self-healing”) if files go missing.

It will install any needed .NET and system dependency software often without user interaction.

Page 2 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.20 Release Notes | SmartSDR+ v4.2.20 New SmartSDR+ Features: These are the new features introduced in the SmartSDR+ v4.2.18 Early Access release that are now available to all SmartSDR+ Feature License holders.

Feature Description Supported Radio Models

SMART-205

Band Plan/Band Edge Markers: SmartSDR now includes an integrated band plan display feature that provides a visual, color-coded representation of amateur radio frequency allocations based on IARU regional standards, including detailed sub- band information on the panadapter.

This feature gives operators a clear, at-a- glance understanding of band usage recommendations directly within SmartSDR, helping ensure compliant and efficient operation across different international band plans.

Band plans for IARU Region 1, Region 2, and Region 3 can be selected from the panadapter display menu, providing an optional context-aware display based on the selected or active region, showing clearly defined sub-band segments within each amateur band.

The default IARU region is based on the radio’s region setting.

Aurora

FLEX-8000

FLEX-6000

SMART-11334

User Configurable RX Filters: SmartSDR now includes mode-specific, user configurable receive filters, allowing operators to tailor receiver bandwidth characteristics independently for each operating mode.

This enhancement provides greater flexibility and precision in tailoring audio and signal response for different types of operation, such as SSB, CW, AM, FM, and digital modes.

Additional benefits include reducing the need to manually reconfigure filters when changing modes and allowing users to fine-tune receive filter characteristics for contesting, DXing, or digital operation.

Aurora

FLEX-8000

FLEX-6000

SMART-12046

Display TX Filter on Panadapter: SmartSDR now includes an optional feature that displays the transmit filter bandwidth directly on the panadapter, with an additional on-screen overlay indicator.

This allows for real-time tracking of transmit filter bandwidth changes as mode or bandwidth settings are adjusted.

From an operational standpoint, this feature provides immediate visual confirmation of transmit signal bandwidth, helping operators ensure transmitted energy remains within the ham bands, which is particularly useful when operating near band edges.

Aurora

FLEX-8000

FLEX-6000

Some bug fixes may be specific to radio hardware platforms and SmartSDR+ feature license holders.

Please refer to the SmartSDR v4 Changelog for a complete listing of all SmartSDR v4 software and firmware changes.

Feature/Defect Description SMART-12729 Fixed: FDX does not work with single SCU radios.

SMART-12734 Changed default CW Receive Filter presets to 50 Hz, 100 Hz, 250 Hz, 500 Hz, 1 kHz, and 3 kHz.

The 1 kHz and 3 kHz options are now pitch aware.

Reset factory settings after updating to v4.2.19 to expose new default values.

SMART-12738

Fixed receive audio going silent after 30 seconds to 2 minutes of connection to SSDR and Maestro in some setups SMART-12758 Changed default Digital Receive Filter presets to 100 Hz, 300 Hz, 600 Hz, 1 kHz, 3 kHz, 6 kHz. Reset factory settings after updating to v4.2.19 to expose new default values.

SMART-12780

Fixed Maestro drops remote audio after ~3 min.
SMART-12747 Mic Gain Slider now adjusts the PC Mic
SMART-12735 Restored the Offset menu item in the Slice Flag DSP Menu when set to Digital modes

SMART-12536

Fixed an issue where the TGXL Tune command from SmartSDR and API was not triggering Tune

SMART-12748

Fixed an issue with 6000 Series Radios where receive audio would not come back promptly after keying CW with some setups. SMART-12772 XVTR output power now scales with the RF Power setting

SMART-12743

Fixed an issue where the Tune button didn't trigger Tune on some XVTR bands Page 4 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.20 Release Notes | Description of SmartSDR Basic, SmartSDR+, and SmartSDR+ Early Access Feature License Tiers: SmartSDR v4 Basic is available free of charge and includes all bug fixes and select minor feature enhancements for all radio models.

We strongly encourage all customers to upgrade to SmartSDR v4.

If you are currently licensed for SmartSDR v2 and upgrade to SmartSDR v4 Basic, you will receive all prior bug fixes and minor enhancements from a

Release notes & download

Version 4.2.18 Released Apr 28, 2026 First seen Sep 6, 2026

DAXv2 improves audio latency and Windows compatibility while adding 64-bit/ARM processor support and band plan with configurable RX filters. — summary by updatemystuff.com

Source: flexradio.com

Show release notes

Page 1 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.18 Release Notes | SmartSDR+ v4.2.18 Release Notes Version Release Date Release Theme/Title 4.2.18 2026-04-28 DAXv2. 64-bit SmartSDR, DAX, and CAT.

Band Plan & RX Filter Presets SmartSDR Basic™ and SmartSDR+™ v4.2.18 is an Early Access software and firmware release for Aurora™, FLEX-8000™, and FLEX-6000™ series SDRs, as well as Maestro™.

This version supersedes all previous SmartSDR releases and is available to all users.

Access to new features introduced in this release is limited to SmartSDR+ Early Access feature license holders unless otherwise noted.

Important Release Information Before upgrading, please review all sections marked as IMPORTANT for upgrade prerequisites and other critical information.

There are multiple important notices associated with SmartSDR v4.2.18.

You should understand these changes before upgrading from a previous version of SmartSDR.

Please open a HelpDesk support ticket if you have questions.

Important Notice: It is highly recommended to uninstall all previous versions of SmartSDR before upgrading to SmartSDR v4.2.18.

Prior to installing SmartSDR v4.2.18, it is strongly recommended that all previous versions of SmartSDR be completely uninstalled from your PC, including DAX and the FlexVSP driver.

SmartSDR v4.2.18 introduces a new software architecture that includes updated DAX and FlexVSP drivers.

Retaining older versions on your system may result in installation conflicts or degraded performance.

For best results, ensure all earlier SmartSDR versions (v4.1.5 and below) are fully removed before proceeding with the installation.

Refer to the HelpDesk article “How to Install SmartSDR v4.2.18” for detailed uninstallation and installation instructions.

Important Notice: SmartSDR for Windows supports both x64 and ARM processor platforms.

We are excited to announce expanded platform support for SmartSDR for Windows, DAX, and CAT, including their respective audio and virtual comm port drivers, with the introduction of native compatibility for both x64 (64-bit) and ARM-based processors.

These new features are available for all users.

The x64 version of SmartSDR for Windows replaces legacy 32-bit support, aligning with modern Windows standards and improving overall system efficiency.

This enhancement ensures that SmartSDR can take full advantage of the evolving Windows hardware ecosystem.

When downloading SmartSDR for Windows, make sure that you select the correct installer that aligns with your PC's processor architecture by referring to the HelpDesk article Which SmartSDR Installer Do I Need to Download?

Important Notice: Upgraded DAX to a completely new audio transfer architecture.

Starting with SmartSDR v4.2.18, the DAX functionality has been completely re-architected and is now called DAXv2.

This update delivers significant architectural improvements, enhanced low-latency performance, and improved compatibility and stability with modern Windows systems.

DAXv2 is available for all users.

In addition, DAXv2 is available as a native x64 and ARM application.

The new DAX driver no longer relies on deferred procedure calls (DPCs) for transferring audio data from the radio to PC applications.

For a complete listing of changes, refer to the HelpDesk article DAX Version 2 - Improvements and Updates.

Starting with SmartSDR v4.2.18, the FlexVSP driver, used to create virtual comm ports, has been upgraded to be fully compatible with both x64 and ARM versions of Windows 11.

As with DAXv2, this update is available for all users.

Important Notice: SmartSDR for Windows utilizes a Microsoft Installer (MSI)–based installation package.

Upgrading to an MSI installer architecture provides a standardized installation environment that can automatically detect and repair missing/corrupted components (“self-healing”) if files go missing.

It will install any needed .NET and system dependency software often without user interaction.

SmartSDR+ v4.2.18 New SmartSDR+ Early Access Features: As noted below, radios licensed for SmartSDR+ will gain access to these new features approximately 30 days after this Early Access release with a follow-up release of SmartSDR v4.2.

Feature Description Supported Radio Models

SMART-205

Band Plan/Band Edge Markers: SmartSDR now includes an integrated band plan display feature that provides a visual, color-coded representation of amateur radio frequency allocations based on IARU regional standards, including detailed sub- band information on the panadapter.

This feature gives operators a clear, at-a- glance understanding of band usage recommendations directly within SmartSDR, helping ensure compliant and efficient operation across different international band plans.

Band plans for IARU Region 1, Region 2, and Region 3 can be selected from the panadapter display menu, providing an optional context-aware display based on the selected or active region, showing clearly defined sub-band segments within each amateur band.

The default IARU region is based on the radio’s region setting.

Aurora

FLEX-8000

FLEX-6000

SMART-11334

User Configurable RX Filters: SmartSDR now includes mode-specific, user configurable receive filters, allowing operators to tailor receiver bandwidth characteristics independently for each operating mode.

This enhancement provides greater flexibility and precision in tailoring audio and signal response for different types of operation, such as SSB, CW, AM, FM, and digital modes.

Additional benefits include reducing the need to manually reconfigure filters when changing modes and allowing users to fine-tune receive filter characteristics for contesting, DXing, or digital operation.

Aurora

FLEX-8000

FLEX-6000

SMART-12046

Display TX Filter on Panadapter: SmartSDR now includes an optional feature that displays the transmit filter bandwidth directly on the panadapter, with an additional on-screen overlay indicator.

This allows for real-time tracking of transmit filter bandwidth changes as mode or bandwidth settings are adjusted.

From an operational standpoint, this feature provides immediate visual confirmation of transmit signal bandwidth, helping operators ensure transmitted energy remains within the ham bands, which is particularly useful when operating near band edges.

Aurora

FLEX-8000

FLEX-6000

Page 3 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.18 Release Notes | New SmartSDR Basic Features: The following features are available to all users regardless of the SmartSDR feature license version installed on the radio hardware. Feature Description Supported Radio Models

SMART-12134

TURF Changes: New 60m allocation for the US. A new US TURF file is not needed to utilize the new 60m frequency allocation. Aurora

FLEX-8000

FLEX-6000

SMART-11748

New ARM processor support for SmartSDR for Windows, SmartSDR, CAT, DAX, and
FlexVSP drivers
Aurora

FLEX-8000

FLEX-6000

SMART-11323

Added support for an external sampler for use with SmartSignal (aka “APD”) when operating with external amplifiers.

This enhancement enables the radio to use a real-time RF sample from the amplifier output, allowing it to measure and correct distortion introduced after amplification.

The result is improved linearity and cleaner signal performance, particularly at higher power levels.

Aurora

FLEX-8000

SMART-12206

Added APD Reset Button - This will clear the current solution and look for another Aurora

FLEX-8000

SMART-12223

Added new Waveform Deployments. You can now utilize our open API and Docker container to deploy waveforms on your radio. Aurora

FLEX-8000

Page 4 | Copyright 2026 FlexRadio, Inc. | SmartSDR v4.2.18 Release Notes |
SmartSDR Bug Fix Highlights:
Below are the bug fixes highlights for SmartSDR v4.2.18. Some bug fixes may be specific to radio hardware platforms and
SmartSDR+ feature license holders.
Please refer to the SmartSDR v4 Changelog for a complete l

Release notes & download

Version 4.1.5 Released Dec 16, 2025 First seen Sep 6, 2026

Bug fixes for S-meter pegging with ESC toggle, DIV audio controls, and multiFLEX DVK playback transitions. — summary by updatemystuff.com

Source: flexradio.com

Show release notes

Page 1 | Copyright 2025 FlexRadio, Inc. | SmartSDR v4.1.5 Release Notes | SmartSDR+ v4.1.5 Release Notes Version Release Date Release Theme/Title 4.1.5 2025-12-16 SmartSDR v4 Bug Fix Release SmartSDR Basic™ and SmartSDR+™ v4.1.5 is a software and firmware release for Aurora™, FLEX-8000™, and FLEX-6000™ series of software defined radios (SDRs), and the Maestro™.

This version supersedes all previous versions of SmartSDR.

Description of SmartSDR Basic, SmartSDR+, and SmartSDR+ Early Access Feature License Tiers: SmartSDR v4 Basic is available free of charge and includes all bug fixes and select minor feature enhancements for all radio models.

We strongly encourage all customers to upgrade to SmartSDR v4.

If you are currently running SmartSDR v2 and upgrade to SmartSDR v4 Basic, you will receive all prior bug fixes and minor enhancements from all previous versions.

However, please note that multiFlex, the major feature introduced in SmartSDR v3, is not included in SmartSDR v4 Basic for radios licensed for SmartSDR v2.

For radios licensed for SmartSDR v1, the SmartLink feature introduced in SmartSDR v2, along with the multiFlex, is not included in SmartSDR v4 Basic.

SmartSDR+ is an optional one-year new feature license.

When you purchase a SmartSDR+ feature license, you gain or retain access to all prior SmartSDR v2 and v3 major features, as well as all new SmartSDR v4 major features released during your one-year license period.

All new SmartSDR v4 features are only available immediately for SmartSDR+ Early Access feature license radios.

Radios that have a SmartSDR+ feature license will gain access to the new features approximately 30 days later with a follow-up SmartSDR v4 feature access software release.

To get the new SmartSDR v4 features immediately, a SmartSDR+ Early Access license is required (see below).

When your one-year feature license expires, you retain all features received during that period—you never lose them.

To gain access to any new features introduced after your license period ends, simply renew your SmartSDR+ license for an additional year.

SmartSDR+ Early Access is an optional one-year SmartSDR+ feature license that provides all the benefits of SmartSDR+, with the added advantage of early access to new features approximately 30 days before they are available for standard SmartSDR+ feature license holders.

As part of the Early Access Program, participants are invited to share feedback with the software engineering and product management teams based on their experience with the preview software.

This collaboration helps shape and refine future SmartSDR releases.

Important Release Information Before upgrading, please read all sections marked as IMPORTANT for upgrade prerequisites and other important information.

Important Notice: Beginning with SmartSDR v4.0.1, the SmartSDR hardware license installed on your radio must be revalidated or updated after purchasing a SmartSDR+ Feature License by connecting to the SmartSDR License Server.

To complete this process, ensure that your radio is connected to a network with Internet access.

The radio will automatically download any new licenses when it is booted.

Once your SmartSDR license has been successfully validated, the radio will not need to reconnect to the License Server unless you purchase a new SmartSDR+ feature license.

Page 2 | Copyright 2025 FlexRadio, Inc. | SmartSDR v4.1.5 Release Notes | SmartSDR+ v4.1.5 New SmartSDR+ Early Access Features: There are no SmartSDR+ Early Access Features included in this software release.

New SmartSDR+ Features: There are no SmartSDR+ Features included in this software release.

New SmartSDR Bug Fixes: Below are the new minor feature enhancements and bug fixes available to all radios running SmartSDR Basic.

Some bug fixes will be specific to SmartSDR+ features and not available to SmartSDR Basic license holders.

Please refer to the SmartSDR v4 Changelog for a complete listing of all SmartSDR v4 software and firmware changes.

Feature/Defect Description

SMART-11954

Fixed an issue where toggling ESC would peg the S-meter on FLEX-6000 Series Radios

SMART-12099

Fixed DIV ESC slice audio controls to be consistent with the operation intent (SmartSDR-Win)

SMART-12118

Fixed an issue where profiles with DIV access were restored with DIV ESC enabled

SMART-12129

Fixed multiFLEX DVK playback not properly transitioning from transmit back to receive Page 3 | Copyright 2025 FlexRadio, Inc. | SmartSDR v4.1.5 Release Notes | SmartSDR v4 Best Practices Best Practices for Installing SmartSDR Always back up your Global, TX (transmit), and Microphone Profiles.

For detailed instructions on exporting your profiles to a file on your PC, refer to the SmartSDR for Windows Software User’s Guide.

It is recommended to export all profiles before upgrading to v4.1.5.

Maintaining a good set of profile exports as backups is always a best practice.

Moving back and forth between different versions of SmartSDR may result in data loss unless you have a backup (export) of your Profiles.

Ensure your Windows operating system is up to date before installing SmartSDR for Windows.

The proper operation of SmartSDR for Windows and its associated drivers relies on having an up-to-date and supported Windows operating system, including the root security certificates.

It is strongly recommended that you run Windows Update and install all mandatory and optional updates before installing SmartSDR for Windows.

Power cycle the radio before installing a new version of SmartSDR for Windows.

To ensure a seamless upgrade, it is recommended that you power cycle your radio before installing the SmartSDR for Windows software on your PC and updating the radio firmware. “Cold Boot” the radio after upgrading the radio firmware.

Using the power button, shut down the radio, then disconnect it from DC power for approximately 30 seconds.

This procedure “cold boots” the radio and helps ensure proper operation.

Once DC power is restored to the radio, wait 2 minutes to ensure all internal processors have booted up completely before booting your radio.

Managing SmartSDR installed on other devices.

If using Maestro or other PCs running SmartSDR for Windows, update all devices at the same time to ensure a consistent operating experience and to avoid radio firmware upgrade/downgrade delays.

Always perform a Factory Reset of your Radio when Downgrading the Radio Firmware: In general, downgrading to a previous version of SmartSDR is not recommended.

The database in the Aurora, FLEX-8000, and FLEX-6000 is NOT backwards compatible.

This means if you downgrade the firmware in your radio, you must perform a Factory Reset to ensure the internal database is consistent with the version of SmartSDR firmware that is running on the radio.

Important: If the radio is not operating properly immediately after upgrading, please perform a factory reset and refrain from importing any exported profiles.

The database may be inconsistent and require resetting to a default state.

The procedure for performing a Radio Cold Boot and Factory Reset is described below.

In addition to performing a Factory Reset on the radio, you mustn't import a database using a profile export that is greater than the version you are using with your radio.

The profile export file name contains the version of SmartSDR that was running when the export was saved to your PC for easy version identification.

Best Practices for installing SmartSDR for an “M” Model or Maestro The following best practices are applicable only when installing a new version of SmartSDR on a Maestro.

Both the Maestro and “M’ Model radios must have network access that allows connectivity to the Internet to download the new SmartSDR software.

Ensure your Maestro has a reliable power source.

Make certain the supplied AC adapter is used to power the unit.

This prevents the Maestro from losing power during an update.

Ensure your Maestro has a reliable network connection.

The Maestro and radio firmware ar

Release notes & download

Version 4.1.3 Released Dec 3, 2025 First seen Sep 6, 2026

Enables noise mitigation, digital voice keyer, and CW auto-tune for SmartSDR+ users. — summary by updatemystuff.com

Source: flexradio.com

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Page 1 | Copyright 2025 FlexRadio, Inc. | SmartSDR v4.1.3 Release Notes | SmartSDR+ v4.1.3 Release Notes Version Release Date Release Theme/Title 4.1.3 2025-12-03 Aurora Support and SmartSDR+ v4.0.1 Feature Activation SmartSDR Basic™ and SmartSDR+™ v4.1.3 is a software and firmware release for Aurora™, FLEX-8000™, and FLEX-6000™ series of software defined radios (SDRs), and the Maestro™.

This version supersedes all previous versions of SmartSDR.

Description of SmartSDR Basic, SmartSDR+, and SmartSDR+ Early Access Feature License Tiers: SmartSDR v4 Basic is available free of charge and includes all bug fixes and select minor feature enhancements for all radio models.

We strongly encourage all customers to upgrade to SmartSDR v4.

If you are currently running SmartSDR v2 and upgrade to SmartSDR v4 Basic, you will receive all prior bug fixes and minor enhancements from all previous versions.

However, please note that multiFlex, the major feature introduced in SmartSDR v3, is not included in SmartSDR v4 Basic for radios licensed for SmartSDR v2.

For radios licensed for SmartSDR v1, the SmartLink feature introduced in SmartSDR v2, along with the multiFlex, is not included in SmartSDR v4 Basic.

SmartSDR+ is an optional one-year new feature license.

When you purchase a SmartSDR+ feature license, you gain or retain access to all prior SmartSDR v2 and v3 major features, as well as all new SmartSDR v4 major features released during your one-year license period.

All new SmartSDR v4 features are only available immediately for SmartSDR+ Early Access feature license radios.

Radios that have a SmartSDR+ feature license will gain access to the new features approximately 30 days later with a follow-up SmartSDR v4 software release.