Reverting back to Taz 4 nozzle(and head) from Taz 5

I have been having the same pla printing issues with the new hex nozzle. I want to revert back to my bush nozzle since I heard it prints PLA better. When I update the firmware on the taz, it ends up all glitchy on the lcd screen and it wont increase the temperature of my nozzle. Am I missing a step or something? Can someone help me revert back to use the bush nozzle?

I think you mean Buda hotend. I would just download it fresh from here because maybe the one you have got jacked up somehow.