Why does updating an older iphone seem to ruin it?

Apps stop working right, it drags behind, connectivity goes to hell…

I can give you a very long technical answer that is not going to fit here, but in short Apple needs to make you buy a new phone every now and then because that's what makes this industry run. Don't hate me but get an Android. Yes they do rely on the same principle but the competition is much fiercer which yields much better results.

Thats because your are using hardware that is far behind, and hardware advances rapidly. New OS's are written for the new phones, so yeah they run on older ones, but don't expect the older hardware to handle it as well.

Can't say I've had a similar experience. I had the original iPhone up to when it no longer got updates & it worked fine.

The apps situation is basically to the developers to make sure that they work properly with the new version of the OS.

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