How to downgrade 8.1.3 to 8.1.2 or even 7.1 on 4s?
Im having major shut down issues with my 4s since the 8.1.3 update! My phone is 3 days old, refib from Sprint and the said the update wont hurt but my phone keeps shutting off between 20-40% battier life! Plus as like others my battery drains down fast and then will shut off like I said at 40% to 20% of power left! Can I downgrade? Need help and thanks!
iPhone 4S, iOS 8.1.3