Hello everyone. My 6.1.3 jailbroken iPhone 5's speakers do not work. The phone is still under warranty, so I can bring it into an Apple store to be fixed. However, I have to re-format my device to factory settings so my warranty is not voided. After Apple fixes the phone, can I downgrade to 6.1.3 to jailbreak again? Or is there another solution to this? Thanks guys.