2U is a common fake clone controller. It sounds like the Shanwan PS3 clone controller, they do the same thing.
If the controller has PS3-like wireless, you can set it up using the setup script. Try the Shanwan option in the PS3 controller menu.
If the controller does not have wireless, open it with a screwdriver and disconnect the vibration motor.
Recalbox dudes report they couldn't get this working no matter what: https://github.com/recalbox/recalbox-os/issues/394
You might have to just buy a better controller. Sometimes cheap stuff works OK (like those $5 SNES controllers) but evidently not this time.