99 Mitsubishi 300gt Vr4 Help

Ok my dad has this car and his battery died yesterday …I guess after a few times of trying to piss with the battery and jumping it the radio locked him out now…Does anyone have any idea of how to get back into the radio he has the correct code and everything

pull the radio and call a mitsu dealer. give them the serial number on the back. they also might ask for proof of ownership too though. or does he have the owners manual? it will be in there as well. i think on the inside cover it should have the lockout code on it

http://www.3saudiofaq.com/radiocode/radiocode.htm

I’d love to have his car.