@Hydrostan the port people are referring to was found on the bottom of the original MP MPP and
M2P controllers ,one of the biggest gripes about the
Mini 1 was the fact that it was missing from the RC
on top of that it meant that the single side port was responsible for any cables that are used to charge the RC,and communicate with the screen device
it is also very easy to damage if by mistake the connector is forced in the wrong way up
have you tried a different cable to your device as they can fail over time
one way of trying to prevent the issue of the connector is to mark the top side so at least you know it is inserted the correct way ,if the port is damaged it is possible to put a new one in
but it requires nearly all of the RC innards to be removed and it quite a fiddly job
it would probably be better to source a second hand RC there seem to be plenty of them around on the web