On an iPhone 7, a missing or "null" IMEI is rarely a software glitch you can fix with a simple download. It is typically caused by a in the baseband circuit.
The tool, which he called the Sibyl —after the ancient Greek oracles—was his secret weapon. He’d built it over eighteen months, reverse-engineering Apple’s SEP (Secure Enclave Processor) handshake protocols and patching together vulnerable bootrom exploit code discovered by an anonymous hacker in Belarus. The Sibyl could talk directly to the iPhone’s baseband chip at a level lower than the operating system, lower than the bootloader, lower than logic. iphone 7 imei repair tool
