This firmware is really good. it lets you have 5 diffrent save slots for each game. You can also back up the save whenever you want by pressing start. Check it out.This should work on all of the clones.
@BigOnYa, shame to hear. Sure that thing treated you well over the years. Not sure of the exact cause of death of mine but it's reluctant to start and has a metal on metal squeal from the motor and developed a knock all of a sudden. Got it towed to my mechanic, its hard to crank by hand, and when he threw his booster pack on it the starter let out the magic smoke
20 years old, 250k miles, got to drive it cross country once, had a junkyard motor put in it a few years back. Treated me mostly well but not without its fair share of headaches. Regardless, it had a small amount of frame rot, and that right there alone is enough to sign the death warrant.