download the software update but its no installed tap install an error occuring in many times therefore istall software at immediatly fast
install the software update in fast
iPhone 6s, iOS 11
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See the articles below.
Get help with over-the-air iOS updates -
Update – Can’t or can’t restore -
Have you tried using iTunes on a computer or Finder if running Catalina or later to do the update?
Update software on iOS devices in iTunes on Mac. -
If you see an error when you update or restore your iPhone, iPad, or iPod *
Updating iOS: common issues and solutions. -