The last time ALP connect worked for me was a 2017 September/November build (I think) then stopped working at January.

It might be possible to downgrade and test it, I think GTX has a file on his mirror called Stock_keys_test that has been signed with superdaves keys and it should be a stock Joying rom from September, U can remain on custom keys and flash it.

IF u do try downgrade, there is a risk of bricking, so please be aware.

GTX is a wizard at these units, hopefully he can work a fix out

I have MCU problems with mine but as soon as I sort it I will see if I can get it to work