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 men​u 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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Other versions for this product

See the full firmware history for the Bolt 4K