Apple released iOS 9.3 earlier this week. It offers a lot of solid upgrades, including Night Shift, and we generally recommend that you apply the update. There were some folks who ran into trouble, however, and ultimately ended up with useless iPad 2 units. That should be fixed now.
First – here’s a bit on the bug: Apple admitted that iPad 2 owners who applied the iOS 9.3 update and forgot their passwords could be left with an iPad “in an inactivated state until they can recover or reset their password.” Apple temporarily pulled iOS 9.3 for those devices, which also technically included the iPhone 5s and earlier iPhones and the first iPad Air and earlier devices.
9to5Mac said recently that a new version of iOS 9.3 is rolling out now. Folks who already applied the update to devices other than the iPad 2 won’t notice anything. It’s just a different build, not a totally new version, that should address the issues that were causing problems with the iPad 2 and, theoretically, should fix those problems.