My iPhone 8 Plus isn’t allowing me to download iOS 15.7 or 16. What do I do?
My iPhone 8 Plus isn’t allowing me to download iOS 15.7 or 16 even though I have enough storage. What do I do?
iPhone 8 Plus, iOS 15
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It would be helpful if you explained what is happening when you try to update, but in the absence of any detailed information, take a look at this.
If your iPhone or iPad won't update - Apple Support
This also a very useful user tip that might help.
Updating iOS: common issues and solutions - Apple Community