downgrade

I have a 422gw with the most recent firmware update (R19.9) and for months have had problems with it freezing after 20 odd seconds. I have tried multiple different cards (including the original Nextbase one it came with) and have now tried at least 2 different firmwares to no avail. I have seen...

I have a problem with my SD card and I think it will be solved if I update the firmware, But unfortunately I cant update or downgrade to any version. when I put the firmware.bin file on my SD card, a window pops up and ask for updating. I select left button (since I have chinese version, I can't...