With the iPhone 7, Apple introduced aggressive . The logic board now pairs with the front camera, earpiece, home button, and battery via software. But the most devastating lock is on the baseband (modem) chip . If the phone detects any mismatch between the stored IMEI in the NVRAM (Non-Volatile Random Access Memory) and the chipset, it can permanently disable cellular service.
Professional technicians often use multi-functional software boxes to restore corrupted device data.
Once hardware is repaired, software tools are used to "re-bind" the components: iTunes / Apple Configurator