tepples wrote:
Cut pin 4 of the lock CIC inside your NES. It'll get confused and think it's another key, and it won't do any locking.
One crazy idea is to use a bypass chip that swaps the pin 4 of the CIC to a pin in the cart so that the NES has the key and the cart has a bogus lock.
This is known otherwise as installing a mod-chip.
Don't blame me if you fry your NES trying to get that to work in order to make newer retail carts work of which test for a key CIC in the NES.