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(Sorry for my bad english^^)

On SNES (RetroPie 3.0 Beta 2), I got it to work!

First, I switched to “lr-snes9x-next” (/home/pi/RetroPie-Setup/, “Install individual emulators…”, “lr-snes9x-next”).

Then, I opened /opt/retropie/configs/snes/retroarch.cfg and added the following line:
input_libretro_device_p2 = “257”

If you have configured your controllers in “/opt/retropie/emulators/retroarch/configs”, then you need nothing more to do – just connect your gamepad and run your Game. Successfully tested with Bomberman…