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If the IMEI is null or the certificate is corrupted (often shown as "Not Registered on Network"), technicians use specialized tools:

Ensure the SIM card is clean and properly seated. A damaged SIM card tray is a common cause for this model. 2. Software & Firmware Solution (Pro Method) If the IMEI is null or the certificate

Ensure the small coaxial cable connecting the main board to the sub-board is not loose or broken. If the IMEI is null or the certificate

The RF transceiver or the Power Amplifier (PA) IC may have dry solder joints. Reheating or "reballing" these components is a standard 100% solution for persistent hardware-level signal loss. If the IMEI is null or the certificate