I can’t update my iPhone to iOS 15
Why can’t I update my phone???
iPhone SE, 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. Your stats show you are running iOS 14, if it's 14.7, you have a beta version installed and need to remove it.
• 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
https://support.apple.com/en-gb/HT201435
How to uninstall iOS beta software.
Go to Settings > General > Storage and delete the 14.7 profile if there is one in there.
Then go to Settings > General > Profiles and delete the 14.7 profile. Restart your phone and you should now be able to update.