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On MediaTek smartphones, the IMEI number, Wi-Fi MAC address, Bluetooth ID, and calibration data are permanently stored in specific hardware partitions called (Non-Volatile Random-Access Memory) and NVDATA . Common Causes of IMEI Loss
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IMEI repair operations can potentially wipe user data. Always perform a complete backup first. On MediaTek smartphones, the IMEI number, Wi-Fi MAC
How to Fix Null or Invalid IMEI on MediaTek Devices (Using MTK IMEI Repair Tool) If you share with third parties, their policies apply
Using SP Flash Tool with the "Format All + Download" option wipes the NVRAM partition entirely, erasing IMEI data along with it. Many forum users report this as the single most common cause of IMEI loss on MTK devices.
Click "System Config" and select the APDB and BPDB files corresponding to your device firmware.