Hey need to install iOS 15 or later having problems
Need to install updates iOS 15 or later having issues
iPhone 12, iOS 14
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What happens when you try?
Can you post a screenshot of the whole screen, it could reveal why you aren't able to update.
Make sure you:
• Are using a WiFi connection (not a hotspot).
• You have an active cell signal (You need both WiFi and cellular service to perform the upgrade).
• Have your battery charged at least 50%. Better yet, keep it plugged in during the update.
• Are not using a VPN connection.
• Do not have power save mode turned on.
• Do not have a beta version installed.
• You have at least 6 gigs of storage available.
You can also check out this article for help -
If your iPhone, iPad or iPod touch won’t update
If your iPhone, iPad or iPod touch won't update – Apple Support (UK)