factory seting
i buy a new iphone 13 pro and the shop turn it on and now i can't sync my new phone with the old one
iPhone 13 Pro, iOS 15
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In order to transfer data from old to new phones the new phone must show the Hello screen, ie not set up.
If it has been set up already you must reset it to factory and start again.
How to factory reset your iPhone, iPad, or iPod touch - Apple Support
then
Use Quick Start to transfer data to a new iPhone, iPad, or iPod touch - Apple Support
or See the instructions in Transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch - Apple Support