OpenGarage › Forums › OpenGarage Firmware › [Resolved] Downgrade from 1.1.0 to 1.0.4 by mistake › Reply To: [Resolved] Downgrade from 1.1.0 to 1.0.4 by mistake
Depending on what version of OG you have, it may or may not have on-board USB-serial chip (CH340G). You can certainly use an external USB serial adapter to flash the firmware.
Before you do that, I am not entirely sure why OTA update doesn’t work: sure you downgraded to 1.0.4, but all firmwares support OTA update. Did you get any specific error message or something?