Can't update to 9.3

Have you tried over-the-air updates? settings/general/software update. Make sure your phone is plugged in and make sure Wi-Fi is enabled. If it doesn't show up try rebooting your phone. This is what apple is calling a regional update so you may have to wait, but I suspect most people have it now. Also the only thing that's required are your apple ID and password. Not sure what you mean by keys?

As I posted in the article about 9.3 being released, I too am having this problem. As explained there, I have tried both over the air and via ITunes updates.

I did find a way to delete the update from my IPhone, as it had been downloaded but wouldn't install. Now, both my IPhone 5S and ITunes say that 9.2.1 is the latest version. IPhone still shows 1 update available, but when you go into Software Updates, it says 9.2.1 is the latest.

someone said that the fix for the problem that caused Apple to withdraw 9.3 for older devices had been released. But both my IPhone and ITunes are behaving as if 9.3 is still not available.

apple has withdrawn the update for older devices because it caused some problems, that's what I read somewhere yesterday. according to what I understood, apple will release a fixed version of the update within a few days. I read this a few hours ago so I don't believe the fix is already available.

Hello,

This is a known issue and the update was pulled by Apple for some older devices. See link below.
http://9to5mac.com/2016/03/24/bricked-iphone-5s-5-ipad-2-ios-9-3-fix/

HTH and good luck.

If you've had this problem and like me keep getting asked to install the update, here's how to make it stop:
1. Go to Settings and then General
2. Go into "Storage and icloud usage"
3. Swipe right until you come to the button "Manage Storage" and click on it.
4. Swipe right until you hear "Software update" and click on it.
5. Swipe to the delete button and click on it. And then confirm.
Done.
4.

I met the same problem. When I first try updating iPhone 6s Plus to iOS 9.3 from iOS 9.0.2, I check for updates with iTunes, and it says iOS 9.2.1 is the latest version. Then I check the update again and it says iOS 9.3 is available. It only takes me about 15 mins to update to iOS 9.3 with iTunes on Mac mini.

The older device fix has now been released here in the UK. I checked for updates in ITunes last night and 9.3 was available again. A huge 1.8Gb download, which was disappointing because I thought IOS 9 was supposed to reduce the size of updates, but at least it's done now.

Also updated my watch to 2.2, although it seems a little more sluggish since. Initially VoiceOver wasn't speaking the focus in new screens or the clock face, but powering off and on again has sorted that. Always a good idea to do that with the watch at least after an update, and possibly even the phone.

I am having this exact same issue trying to update to 9.3.3. I am connected to the internet. The phone is plugged in. I have plenty of space and have tried both over the air updates as well as using iTunes.

I've rebooted the phone. I've deleted the update and tried to re-install more times than I can remember.

Anyone have any suggestions?