Updating firmware for the DJI FPV system cannot be easier, in case you haven’t read the manual you should find this tutorial useful :) The steps are exactly the same for the DJI FPV Goggles, Air Unit and Remote Controller.
Launch the program DJI Assistant 2 on your computer (download here if you haven’t already).
Plug in battery to power on the device.
Connect it to your computer via a USB-C cable.
DJI FPV Goggles:
DJI Air Unit (Full Size):
Caddx Vista Air Unit:
An icon should appear in DJI Assistant 2, click it.
Click Firmware Update on the left menu and choose the latest firmware version. Click Update, and wait until it’s complete. Firmware downloading and flashing should take around 10 minutes or longer depending on your internet speed.
Make sure to do this in a well ventilated area so the Air Unit doesn’t get overheat and shut down during updating.