(09-05-2019, 09:45 PM)rob101 Wrote: I'm having the same mtp error being thrown and blank AA screen as Xarsage mentioned also with rpi 4, using official rpi power supply, ugreen usb sound card and a waveshare touchscreen. I'm going to try using a normal USB mouse instead of the touch screen a bit later.
Edit: i tried that, but turned out i just had to turn on USB debugging
Hold on, so you managed to run AA just by turning on USB debugging? is it on your phone > System > Developer options > Debugging > USB Debugging (Debug mode when USB is connected) ???
So your Ugreen USB sound card solved or USB Debugging solved it?
(I'm at my work place, can't try this until back home)