Just recieved my repro of conker's bad fur day, i tried to make a backup of the game and my current save file, it backups both successfully but when i try to write the save back to the cartridge it looks like nothing happened, it writes and verifies successfully but when i put it in the console it still has my last save file.
Edit: Tried reflashing my cartridge, and all i get is a black screen. Tried changing the file in an hex editor, tried using patches and still nothing the only game that worked was banjo tooie. I have a PAL N64.