@najaray you're NOT the only user using an odroid C2, so instead of saying the img is corrupted, please give us more informations.

Look for the file retroarchcustom.cfg and change the value of input_joypad_driver from udev to sdl2 More info: https://forum.recalbox.com/topic/8125/4-1-slow-game-launch-any-game-emulator/35

@nightfall freat ! the wiki is not that bad afterall

Very ending note for today, i promise! Actually the only way the virtual pad works for me is to set as player 1 input in the controller config options screen. Suppose on 2 player game it would work as input player 2 but that'all for today! Ive also used bluetooth virtual gamepad app from the play store and both phone and raspberry 3 (im using a mod b) see each other but are not able no enstabilish a connection, because these apps - provided bluetooth or not - nedd a server to be installed on the receiving machine the raspi in my case, but since it is too much for me gonna not even try