Upgrade

Welcome to Apple Support Communities.

See: Apple logo with progress bar after updating or restoring iPhone, iPad, or iPod touch - Apple Support.

Jack

lerato49 Said:

"Upgrade: My iPhone is stuck on installation for an upgrade."

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Restart the Upgrade once More:

1. Restart your iPhone, and see if it then is fixed.

2. Use a Computer:

Use my User Tip:  Update your iPhone Using a Computer - User Tip