this is what i did after talking with universal tech support.

to reset the mx-350 to factory default :

hold main and stop.

--warning-- will start flashing at bottom of screen.

continue holding main and stop until --warning-- stops flashing and then you get :

--reset-- at top of screen and options are --sure?-- and --exit--.

press --sure?-- and remote starts initializing and then returns to factory default.

dont know how many other remotes this works for.