Ensure you install the MTK USB VCOM drivers correctly. On Windows 10/11, you may need to disable driver signature enforcement. The V138 tool works best with driver version 3.0.1504.
When flashing dead MTK devices in Sulteng (where power fluctuations can occur), always use a powered USB hub or a laptop running on battery. A sudden brownout can permanently brick a device mid-flash. mtk gsm sulteng v138 best
Flashing any unofficial firmware instantly voids your manufacturer’s warranty. Ensure you install the MTK USB VCOM drivers correctly