I turned on my 3ds but then it just closes but if i use my charger with it, it works. How can i use this without the charger?
You'll have to drill them out. If you're careful, you can do it without damaging the plastic. You just need to drill out the heads and you should be able to remove the remaining part of the screw with pliers when you have the cover off.I can't open my 3ds because my screws are stripped