How to downgrade from iOS 15 beta to iOS 14 without losing any data:
But we're not yet finished.
Some system apps will be misbehaving: Messages, App Store, maybe others. Let's fix that.
- Backup your iOS 15 iPhone to your computer (not to iCloud) just to be safe
- Download the latest iOS 14 ipsw from Apple's servers using Developer portal, or https://ipsw.me
- In Finder/iTunes: Option-click the Update button (not Restore) and choose the ipsw you just downloaded
- Follow the prompts and wait for it to complete
But we're not yet finished.
Some system apps will be misbehaving: Messages, App Store, maybe others. Let's fix that.
- Backup your phone running iOS 14 to your computer (not to iCloud)
- Wipe and setup the iPhone as new
- Using Finder on your computer restore the iOS 14 backup you just made
- You're done! You're running 14 with all your data intact and all apps working perfectly.
- Apps will reinstall after the iPhone restarts
- You may need to log out of iCloud, and then log back in, to get Messages to sync
- Ignore other guides about modifying backup plist files
- Ignore other guides about side-loading fake "downgrader" apps that require you to click on offers/ads
- TimFL1 for final backup/wipe/restore step
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