On iphone, does over the air update and installation of IOS erases all my files?

On iphone, does over the air update and installation of IOS erases all my files?

Nope.

I did it on my iPhone and iPad and all my stuff still here.

Nope, updating to the last firmware does not remove your content on your phone, but a backup doesn't hurt right? Just to be on the safe side, back it up to iCloud then attempt to update it. However I found this unnecessary.

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