Connect your iPhone directly to a computer, running iTunes/Finder, and then, try updating again.
Ref: If your iPhone, iPad, or iPod touch won't update - Apple Support
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Connect your iPhone directly to a computer, running iTunes/Finder, and then, try updating again.
Ref: If your iPhone, iPad, or iPod touch won't update - Apple Support
Connect your iPhone directly to a computer, running iTunes/Finder, and then, try updating again.
Ref: If your iPhone, iPad, or iPod touch won't update - Apple Support
iOS 14.7 is no longer current, and might not (is not?) still getting signed.
You can delete that (Settings > General > iPhone Storage), and re-download iOS 14.8, and maybe get further?
Why do i cant install the iOs 14.7 saying “cant install no longer connected to internet” even tho im connected on a wifi?