[Protect the Bill of Rights]

I upgraded to the 5s last week (yeah, I know- always a model behind ) upgraded to iOS8 a few days later. No problems at all.

[RayChuang88]

Here's the trick for a stable upgrade: remove as many unused apps as possible before attempting the upgrade. In fact, on my iPad Air, the upgrade from iOS 7.1.2 to 8.0 worked okay except for the L-O-N-G time it took to download the installation files for the upgrade.