You Can downgrade or refresh the firmware using DJI Assistant 2 (Consumer Drones Series)
To allow Firmware refresh/downgrade you will have to modify a .ini file
- Go to: C:\Program Files (x86)\DJI Product\DJI Assistant 2 (Consumer Drones Series)\DJIEngine
- Find and copy defaultsetting.ini
- rename to defaultsettingsold.ini
- paste the copied file somewhere else (desktop?)
- Open with notepad and change [wm161]
upgrade_enable=0 to 1 - Save the change, copy and repaste to C:\Program Files (x86)\DJI Product\DJI Assistant 2 (Consumer Drones Series)\DJIEngine
Run DJI Assistant 2.exe
Startup the Mini 2 and immediately connect the USB cable to the PC
after a few seconds, it should connect to the computer and you should see the current firmware with options to refresh or downgrade
Hope this helps.