Undebug? But you said you are trying to debug you tama in the post. Open up your tama and then take out the battery then there are 4 screws (they're tiny) you must use a small screwdriver. After done with that you see there is a metal circle and it saids 'DEBUG' around it. Rub the pencil's LED on the circle. *DON'T OVERDO IT OR ELSE YOUR TAMA WILL BE MESSED UP AND OR YOU CAN PERMENTALLY BREAK IT* Then put your tama all back together and then see if it works. When you see a egg press the middle button, then when the egg hatches quickly press the right button and you can choose you characters. (I was confused by your title and post so I think that's what you were asking. Don't use the eraser because the eraser might mess your tamagotchi up.)