Built today, used RP 3b+, used retropie 4.5.1, created disk, launcedpicade. Screen was backwards and upside down, fixed by editing config file. Added wifi, then went to curl https://get.pimoroni.com/picadehat | bash to run the Picade HAT installer. After running and rebooting, same message. Tried reinstalling. Nothing.
Can assign keyboard keys but not joystick/buttons at all. Help. Not a linux guy so be gentle.