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My device is iPhone X and yesterday I use Unc0ver to Restore RootFS,the device was restarted.And a message came out that:unable to activate face id in this iphone.SO i want to know how to solve this question?
PS:I had changed my display screen in Apple before.
everything is OKAY until I Restore RootFS

Can anyone help me?

I’d just update the phone to 13.3 to see if that fixes your problem. If it’s an iPhone X just Jailbreak with checkra1n after you restore your phone to 13.3.

Try to reload system daemons. If that still doesn't work, you may wanna make sure you have the latest Unc0ver installed and jailbroken. If that STILL doesn't work, update to iOS 13.3 and Jailbreak freely with CheckRa1n. No issues like this on CheckRa1n. It's actually one of the most stable jailbreaks I've seen.