OpenGD77

Happy ending, :D despair was stronger than sanity... the boot mode is not damaged, but the structure is changed. I managed to recover it in the following way: remove the battery from the radio, press the 3 side buttons plus the upper one and reinsert the radio. With this, the green light came on and...

It's true, I mistakenly mixed up the bin file and loaded the newer version with old software, the result is a useless dm1801. it also does not initiate boot mode when pressing the side buttons. If anyone knows a solution, I'm grateful.