Backup can't be restored because it is iOS 12.3.1
What can I do when my old phone had iOS 12.3.1 and my new phone iOS 10.3.3?
When I want to keep the backup?
iPhone XS
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Your "new" iphone MUST run at least iOS 12.3.1 (or later).
Update it:--> Update your iPhone, iPad, or iPod touch - Apple Support
Regards
Giulio
