Iphone 4 stuck on low battery screen?

Ok, my daughter is in crisis:/ Her iphone 4 is stuck on the low battery screen and won't budge. We have tried to restore through itune and it comes up as an error and says it can't complete restore. Other than trying to restore the phone, it will not leave the low battery screen. The iphone is jailbroke and unlocked to use with t-mobil. As anyone expienced this and what is the solution to get it to work properly? We have tried a hard restart but that doesn't work either.

Wait will your iPhone is out of battery, when it is, your iPhone is turned off. Turn it on again, and if it is correct your phone will work again.

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