For the first week after the iOS 8.4 release users could downgrade from iOS 8.4 to iOS 8.3 if they ran into problems or issues.
This week Apple closed this hole and is no longer signing iOS 8.3. That means there is no way to go back to iOS 8.3 after you upgrade. Once you install this update you are stuck on it until Apple releases a newer option. No jailbreak or hack will allow you to go back to iOS 8.3 now that Apple is not signing it. This is one of the most important things to consider.
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