deleted some old models now tx wont start up

this is a devo 8s on deviation 4.0

i just got a used devo 8s and was loading a model .ini file i downloaded here. there were a bunch of what i assume were the last owner's files named random things like "best master cp" etc. i deleted them and now when i power the tx up all i get is a blank screen. anyone know what i have to do to get this fixed?

FDR wrote: Turn it on in USB mode, and copy back the model folder from the filesystem of the installation zip file.

thanks a lot. ill do that when i get home from work and report back.