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Your friend may have had a download of iOS 8.3 downloaded from years ago when it was new so it may have been pre signed by apples servers then and hence why he may have been allowed to update. As for iOS 10 being slow, I don't think it's really a huge issue here's a article explaining performance. https://arstechnica.com/apple/2016/09/good-news-ios-10-runs-pretty-well-on-the-iphone-5-and-5c/. If you've been keeping tabs on iOS 10.3 this will also further increase overall stability/performance. Also it will introduce a new file system so waiting till next week for that to release and then doing your full restore/set up as new would be a ideal path to take. I can tell you first hand iOS 10 on iPad 4 isn't bad at all, yah it's alittle slower loading things but it's a negligible difference and the app support/new features greatly out weight the performance hiccups here or there. iOS 8 by contrast was rather radical with new features/api so even on newer devices it was rather buggy and performance could vary greatly were as iOS 10 is pretty light on new features while further polishing overall stability of iOS. I'd say iOS 10 is iOS 9 performance wise if not slightly smoother as iOS 9 had its own few hiccups performance wise. On my Air 2 iOS 10 runs noticeably smoother than iOS 9 seemed too. I'm really excited for iOS 10.3 for even more stability/optimizations.

Didn't know that, thanks for the information as well!
 
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So I posted on the apply communities and one person proposed an interesting perspective. He said, eventually the iOS will drop iPad 4 which I would then be stuck in iOS 7 for good. That's actually a pretty good point. If my iPad cannot update the current version, I wouldn't be able to get apps or update current apps possibly. Hmmm.. Just food for thought for others who might have the same predicament.
 
So I posted on the apply communities and one person proposed an interesting perspective. He said, eventually the iOS will drop iPad 4 which I would then be stuck in iOS 7 for good. That's actually a pretty good point. If my iPad cannot update the current version, I wouldn't be able to get apps or update current apps possibly. Hmmm.. Just food for thought for others who might have the same predicament.
Yah but being stuck on iOS 10 will be better than 7 as many apps require atleast iOS 8 minimium now
 
Yup that's what I meant. I've backed up my stuff and will probably go through with it. Will update when it's done.

Apple will cntinue to sign off on the latest version for your hardware with a new build. So no need to update now
 
Okay well, I ended up updating it. It all went smoothly some apps are greyed out but it's fine. I did have one problem though. I have about 13gbs of books in one app. The app now crashes when open. Turns out it doesn't really exist anymore this app. I tried downloading another comic reader but it doesn't register my old books. Is there any way to salvage my books? If not, will deleting the app remove the books and free up my 13gb?

For anyone in the future who might come across this and are considering it as well, just make sure all you apps are still around, you might not be able to recover the data post update. It wouldn't hurt to do some cleaning, removing apps you don't use anymore. There's slight lag when opening apps but that could very well be psychological and really isn't a problem. Love the clean look, new features seem useful although I haven't checked out all of it.
 
Okay well, I ended up updating it. It all went smoothly some apps are greyed out but it's fine. I did have one problem though. I have about 13gbs of books in one app. The app now crashes when open. Turns out it doesn't really exist anymore this app. I tried downloading another comic reader but it doesn't register my old books. Is there any way to salvage my books? If not, will deleting the app remove the books and free up my 13gb?

For anyone in the future who might come across this and are considering it as well, just make sure all you apps are still around, you might not be able to recover the data post update. It wouldn't hurt to do some cleaning, removing apps you don't use anymore. There's slight lag when opening apps but that could very well be psychological and really isn't a problem. Love the clean look, new features seem useful although I haven't checked out all of it.
You'd have to delete the app. Did you restore a backup, that might explain the apps being greyed out.
 
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You'd have to delete the app. Did you restore a backup, that might explain the apps being greyed out.
I did not restore but those apps are fine. I could re download and a couple I don't really use anymore either. So deleting the app will free up the space?
 
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