How do I fix my security camera?
my security camera
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You should get the phone checked by Apple:
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2 . If you still can't enroll your face or unlock your device with Face ID, take your device to an Apple Store or Apple Authorized Service Provider, or contact Apple Support about your iPhone or your iPad.
You should always have your device repaired by Apple or an authorized service provider. Improper repair, modification, or use of non-genuine Apple components in the laser systems may prevent the safety mechanisms from functioning properly and could cause hazardous exposure and injury to eyes or skin.
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copied from: If an alert says Face ID has been disabled on your iPhone or iPad Pro