Firmware
Re: Firmware
Like previous post, you're giving almost zero details (not even the transceiver model).
Does the transceiver is in bootloader mode (SK1+Sk2+PowerON) ?
BTW, have you read the user manual ? https://github.com/LibreDMR/OpenGD77_Us ... r_Guide.md
Re: Firmware
Check your device manager shows the OpenGD77 in the Serial devices, if not the driver has not been loaded