I have built chibios-based ArduPlane for Revo-Mini, under BASH/Ubuntu/WSL. I have flashed the revo405_bl.bin bootloader, per Randy’s porting to Chibios documenation. I am running last version of MP, and when I go to load custom firmware, it will reboot the RevoMini, but it doesn’t seem to come back up in bootloader mode. Eventually MP times out. What is wrong between MP and and the _bl.bin? It works maybe 1 in 10 or 1 in 20 times. And with the com port scan/timeout, it’s not a fast failure. I’m lost with what to do from here. I have a nice fast compilation setup under Ubuntu/WSL, but can’t seem to find a reliable way of flashing new firmware on the RevoMini. If I flash the F4Light firmware using only dfu-util, it’s quick and predictable. I’d like to get to that same place with Chibios Arduplane.