i've done it. open up the back part that u open to change the battery. then you will see 4 little screws. unscrew those. take off that part. you will not be able to take it off fully, because of the keychain thing. look for the little circle that says above it "debug". use a pencil to rub back and forth between the semicircles. do this for a little while, without wrecking anything, and then screw it all back up again. if it doesnt work, try it again. but there is some chance that it will wreck your tamagotchi, so dont blame me if this happens. also check pixelmood.com to see more detalied instructions and pictures. have a great day!!!!!