I don't understand how but it helped. Thanks a lot

Hi, my board is Luckfox Lyra Plus.
I executed the command sudo rkdeveloptool ef and since then I cannot revive my board anymore.
I tried everything, but nothing works. Everytime I plug my board to USB it's in maskrom mode. (Bus 003 Device 089: ID 2207:350f Fuzhou Rockchip Electronics Company ...