Looking to downgrade from beta to 15.1 here as well. Will there be any data loss when installing the ipsw from a Mac?
If you use the IPSW, hold alt and click the “check for update” button route, then, no. All it does is delete the iOS and reinstalls with which ever version you’ve selected. Stay in the 15s if your on iOS 15. Don’t go 15 to 14.
Downgrade or just put a fresh copy on of the iOS your on, this method is fast and easy. It can clear up a host of things just reinstalling the iOS. I’d try that before downgrading first. ??
I recommend quitting out of all apps and do a hard restart first on your phone. Full back up to your computer, just incase, then your away!!!