An invalid or null IMEI on a MediaTek MT6580 device completely disrupts mobile connectivity, preventing the device from making calls, sending texts, or connecting to cellular data. This issue commonly occurs after flashing a wrong firmware file, performing a faulty factory reset, or corrupting the device's NVRAM partition.

Modifying mobile identifiers carries legal and functional risks that you must consider before proceeding.

Installing a wrong Android ROM often wipes the NVRAM partition.

Load both the file and the AP_DB file from your stock ROM folder. Enter your 15-digit IMEI values into the prompt boxes.

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Before attempting any "Write" commands, try to back up your current NVRAM/Firmware using SP Flash Tool.

Tap SEND AT COMMAND .

Power off your MT6580 phone completely. Remove the battery if it is removable. Connect the device to the computer via USB without pressing any physical buttons.

Restart your phone to apply the changes and restore network signals. Alternative Tools for MT6580 IMEI Repair