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Getting Your iPhone Repaired Could Ban You From Snapchat
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
I can’t see what was posted above anymore, but the DeviceCheck API lets app developers store 2 binary digits (that means 4 different states: 00, 01, 10 or 11) per device on Apple’s servers. So, no, these don’t get erased during a Factory Reset as they’re stored on Apple’s servers. But your phone will.