I bit the bullet and upgraded to iOS 9.1, and the phone now moves like it's an iPhone 3GS. I can see iOS 8.x is no longer signed, but fortunately I have SHSH of iOS 8.2 saved.

How can I downgrade without losing my warranty? I've heard jailbraking will void warranty, but I guess jailbraking then flashing an iOS version that removes the jailbreak should allow my phone to still be in warranty.

PS: This is not a duplicate of Can I install any iOS version I wish by picking and choosing which firmware to restore?, because it talks about restoring from IOS9 to usinged IOS8 version with SHSH blobs.

marked as duplicate by Tetsujin, grg, RedEagle2000, IconDaemon, bmike Dec 26 '15 at 19:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Jailbreak won't void your warranty, as you can always restore the device to the newest (non-jailbroken) version. – Rob Dec 25 '15 at 12:11

You can't do it, unless you saved your signature while iOS 8 was still being signed. Without a saved signature, there's no way for anyone except Apple to install iOS 8 on any device.

  • You mean a SHSH blob? I've saved those, but don't know what to do with them. – UXNoob4eva Dec 25 '15 at 11:38

Jailbreak will prevent Apple from providing you service/support. As mentioned in the other comments restoring to the current iOS will fix that. The main question that hasn't been posed is : "What is the memory storage of your device?" Current versions of iOS have been optimized for upgraded hardware but you shouldn't experience that drastic of a reduction in overall phone performance. The first thing I'd look at is how much storage am I using before the OS.

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