I updated AM32 to 2.20 due to some issues with desync in 2.19 just to test, and seems arcucopter 4.6.3 is unable to connect to ESC properly. FC: MicoAir743v2-AIO-45A
I get ESC connecting beeping (3 tones _ - “) and ESC OK (short beeps ) in an endless loop - https://youtu.be/9n-fRi8SdV8
Did you revert back to 2.18? When you’re on 2.20 can you still access the configurator?
I don’t have any solutions, I just have the same controller on the shelf waiting for a build.