I'm trying to add an APP, but the APP requires iOS 11.0 . I see I have Software update iOS 14.3 but the "Download and Install" is fixed and won't install
How do I download iOS 11.0 to my phone?
iPhone 7 Plus, iOS 10
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If your phone can be upgraded to IOS 14, you can't install IOS 11.
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 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