: Apple has extended Activation Lock to individual parts. If a donor phone is "iCloud Locked" or in "Lost Mode," parts like the screen, battery, or camera may have restricted calibration or functionality once installed in a new device.
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: Even with genuine parts, some repairs require Apple’s "Repair Assistant" or "System Configuration" software to fully pair the part and enable features like True Tone or Face ID . Core Components to Source : Apple has extended Activation Lock to individual parts