Apple Stops Signing iOS 8.4.1 and iOS 9.0, Downgrades and Restores No Longer Possible
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Posted September 30, 2015 at 11:59pm by iClarified
Apple has stopped signing iOS 8.4.1 and iOS 9.0 following the release of iOS 9.0.2 earlier today.
If you want to stay on iOS 9.0 or 8.4 take care that you do not accidentally update because you won't be able to get back down. If you're still on iOS 8.4 and you do update you will not be able to jailbreak your device.