Teradek Bolt 4K
firmware v4.3.4
Teradek · Released Sep 8, 2023 · First seen Jul 11, 2026
v4.3.4 is not the latest firmware for the Teradek Bolt 4K: the current version is v4.5.1 (October 6, 2026). Go to v4.5.1
What's in this update
Teradek Bolt 6/Bolt 4K Firmware Version 4.3.4
NOTE: All device radios must be updated before use, including standalone Bolts and SmallHD monitor modules
New Features
- Added U-NII-5 (6GHz) support for Europe
- Added static scene optimization option to reduce noise for some video content
- Added antenna self test
- Added pattern generator to TX - generates video at TX to enable testing of video transmission and loop out
Changes and
Improvements
- Temperature and voltage info now updates dynamically
- Background color menu now has a 'Video off' option to disable output when no video is received
- 5GHz/6GHz band is now set to match TX when pairing RX devices
- 5GHz/6GHz band is now set to match last detected TX band when switching between TX devices at the RX
Bug Fixes
- Video colorspace was transmitted incorrectly by Bolt 4K/6 TX monitor modules
- Video output sometimes failed to initialize for TX monitor modules
- Video output could sometimes display RECEIVING VIDEO without displaying real video or the video format info
- RX with multiple paired TXs could sometimes switch to a different TX on power up
- Applying Settings could show unnecessarily after modifying settings or pairing
- Bandwidth status was reported incorrectly after changing video quality settings
- HDMI sources were sometimes not detected if connected before powering Bolt TX
- System would not link in fixed frequency if congestion was detected
- Fixed some rare cases where TX and RX might not link on start up
- Fixed 10 bit HDMI output on Bolt 6 XT RX
- Fixed colorimetry info transmission when using HDMI at TX and RX
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