How to Upgrade from iPhone Running iOS 13.1 Beta to iPhone 11 or iPhone 11 Pro Without Losing Any Data
If you had a prior iPhone running iOS 13.1 beta releases and just got a new iPhone 11, iPhone 11 Pro, or iPhone 11 Pro Max, you may have noticed that you can not restore the iOS 13.1 beta backup to the new iPhone 11 with iOS 13 device. This is because you can’t restore backups from new versions of iOS to older versions of iOS (and iOS 13.1 is newer than iOS 13.0).
There are a few solutions to this problem; setup the iPhone as new and then restore when iOS 13.1 is available, or install the iOS 13.1 beta on the new iPhone 11 / iPhone 11 Pro and restore it from the backup.