Using a tool like the Z3X Box , technicians often repair the IMEI or write a "Cert" file specifically for the G532F.

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 is corrupted (often shown as "Not Registered on Network"), technicians use specialized tools:

If software fixes fail, the issue is likely on the motherboard. Based on community solutions like those from :

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.