Apple Stops Signing iOS 8.3, Downgrades and Restores No Longer Possible
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Posted July 7, 2015 at 5:29pm by iClarified
Apple has stopped signing iOS 8.3, making restores and downgrades to the firmware no longer possible.
If you want to stay on iOS 8.3 take care that you do not accidentally update to iOS 8.4 because you won't be able to get back to iOS 8.3. However, since there is a jailbreak of iOS 8.4 you aren't at risk of losing your jailbreak after an update.
Mine 5s was running on 8.4 JB and the battery life was sucks. So i downgraded to 8.3 JB and now i'm very happy with the battery life. I was hoping 8.3 still open until iOS 9 release.