Answer: https://github.com/recalbox/recalbox-os/issues/389 https://github.com/recalbox/recalbox-os/issues/117 https://github.com/recalbox/recalbox-os/wiki/Manual-(EN)#2---xbox-360-controllers

I double checked everything and did a fresh install.. no progress The strange part is, it all worked perfectly a few weeks ago.

Hey, first of call a big thank you for the recalbox wonderful project!!   I have a problem with the xbox 360 controller and the psx emulator. The button do work, but they are switched. E.g. "x" at the psx is the "a" button on the controller. The other gaming consoles are working great. The buttons were mapped in the menu. I already changed the "controllers.xboxdrv.enabled=1" line and disabled the line for ps3. The right biosfile is placed in the right folder.   Is is possible to change it?