I have two iPhone 8,
src: iOS13.6.1. ( I will not update to latest iOS for some softwares only works in this version)
backed up to my Macbook(Catalina 10.15.7).
dst: iOS12.4
which is connected to my Macbook
I want to copy src to dst exactly, without updating iOS version of either side.
When I restore the dst iPhone with the backup of src iPhone, it failed with error like "the backup is not compatible, you need update the iOS".
It is a hassle to update the dst iPhone to 13.6.1 since it is not the latest version.
So I come to the "Recovery mode", I put the dst iPhone into "Recovery mode", then chose "Restore", however, this just meant restore to factory status.
I have tried to press the "Option" key while click the "Restore" button, it did show Finder and seemed allow me to choose file, but I could not choose the backup file of src iPhone (~/Library/Application Support/MobileSync/Backup/...), I have tried all dirs and files, just were not accepted by the "Restore", the "OK" button was always grey color.
Can anyone help me to achieve my goal: How to copy a iPhone(iOS13.6.1) to another iPhone(iOS12.4) without updating iOS of either side to latest iOS?