New to anything like this, need help fixing Retroarch mistake

Apologies for wasting everyone’s time. I just picked up one of these used yesterday. I was trying to remap the inputs and accidently removed the confirm button mapping. I went to the git repo and put the default retroarch.cfg back into the device through FileZilla, but now I can’t remap any inputs. Hoping there’s an easy solution to this, I was having fun with it before I got careless. Thanks for your time, apologies for wasting it