He couldn't fake the API. But what if he bypassed the check entirely?
He opened a terminal and ran nmap on the router’s IP. Ports 22 (SSH) and 80 (HTTP) were open, but SSH rejected all credentials. Port 8080, however, responded with a raw text prompt: ZTED> zte router network unlock tool
Marcel did something reckless. He dumped the router’s firmware via the backdoor—line by line, hex by hex. Hidden in the filesystem was a file named zte_unlock_cli.py . Python. The tool was right there, but it contained a function called verify_carrier_sig() that called an external API. He couldn't fake the API