There’s Speicherort.txt where you can read it (Show all Files).
scripts and custom.sh in batocera\share\system, OGST in batocera\share
you need WinSCP when you’re using windows (and IP of your XU4)
user is always: root
the default password is: linux
-> go to <root>, open Terminal and enter command:
chmod +x /userdata/system/custom.sh /userdata/system/scripts/OGST_screen.sh
(make custom scripts executable)