27 Feb 2018, 14:12

See here: https://github.com/recalbox/recalbox-os/wiki/Compatibility-(EN)

Probably you should manually modify .cfg file for gamepad, there is one file if you wanna set a global configuration for all yuor controllers, see in folder:

smb://recalbox.local/share/system/configs/retroarch/ and look for the file retroarchcustom.cfg, should get the job done