How to fix white screen of death on Iphone 4s, Ios 9.1, and broken power button?

So after I got IOS 9, things starting getting super glitchy. I eventually got the white screen, and you're supposed to be able to fix it by holding the power button and home screen button. Unfortunately, my power button broke, and Assistive touch's "lock screen" button isn't doing anything.

Factory reset man

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