Hey again, sorry for the confusion. Actually it’s the usb port in the back that’s the problem. It seems to have stopped working altogether. I have the mini m8s ii, and I used the usb port just before upgrading to matrix.
This is a common device so strange that I don’t find any threads about this. I found this, but doesn’t seem to be my issue.
Well, I also installed atvxperience (android9) to get newer bootloader or somesuch before upgrading to latest coreelec. Possibly that’s the issue.