Advanced Usage

DC Extension

Only on JetKVM for now. Support for JetKVM Mini comes in a later release.

The DC Extension rarely needs a firmware update. It can't update over the air, so you flash it from a computer over USB.

Update when the release notes fix something you're seeing. If everything works, you can skip it. To hear about new releases, open the dc-extension-firmware repository and choose Watch, then Custom, then Releases.

Download the firmware

Download the .uf2 file from the latest release:

DC Extension firmware 0.2.0Released 19 September 2025, with release notes

Enter flash mode

  1. Disconnect all cables from the DC Extension.
  2. Press and hold the flash button, between the DC 9V-20V port and the USB-C port. While holding it, connect the board's USB-C port to your computer.
  3. The board appears on your computer as a removable drive.

Flash the firmware

  1. Drag the .uf2 file onto the drive.
  2. Wait for the drive to disappear. The board restarts with the new firmware.