I want to do it before iOS 10 launches and it becomes impossible to use 9. But I'm skeptical given the low-config nature of 5C.

Are there any known performance degradation in 5C if iOS is upgraded to 9 from 8? So far it is working good with 8 and I don't wanna ruin it. The usage is very basic, I have bought it for my Mom.

And, is it really necessary to upgrade? I mean, is it possible that some apps might not work in future because I have not upgraded?

Thanks in advance.

  • There's really nothing to worry about when updating iOS. It's a good idea to backup everything using iTunes, if you can, just in case, but as far as day-to-day use goes, updating from iOS 9 to iOS 8 should actually increase performance, as iOS 9 was released to fix a lot of bugs in iOS 8. – RedEagle2000 Aug 1 '16 at 0:05
  • From iOS 8, you shouldn't see any performance loss, unlike 7 to 8. – JMY1000 Aug 2 '16 at 5:27

The iPhone 5C will run iOS 9 fine, as iOS 9 requires no greater hardware than iOS 8. My inferior iPod Touch 5th gen (comparable to an iPhone 4S, two years older than the 5C) became slow upon upgrading to iOS 8 but didn't get any slower when upgrading to iOS 9.

As always, do a backup before upgrading.

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