How to upgrade the iOS on my iPhone?
My iPhone is running very slow. Thing it needs update.
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About iOS or iPadOS performance on your iPhone, iPad, or iPod touch - Apple Support
have you read thru this support article for updating?
Update your iPhone, iPad, or iPod touch - Apple Support
need more storage for update?
If you need more space for an update on your iPhone, iPad, or iPod touch - Apple Support
issues?
Updating iOS: common issues and solutions - Apple Community
video..