Professional repair using a JTAG programmer or ISP programmer (direct chip access). This requires specialized hardware and expertise. Seek a professional phone repair shop with JTAG capabilities.
Generic Repair IMEI (patch) on MediaTek devices with ChimeraTool
🚀 Fix IMEI on SPD & MTK + Install Drivers with TFT Tool – All FREE!
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.