This is a critical question. Because these tools modify low-level phone partitions (NVRAM, bootloader), they are inherently powerful — and risky.
If you see an error like or "USB Not Found," reinstall the VCOM drivers and check your USB cable.
Most v139 tools include a Drivers folder. If not, download "MTK USB VCOM drivers." mtk gsm sulteng tool v139 install
While holding the buttons, insert your USB cable connected to the PC.
. Power off your phone and connect it to the PC while holding both Volume Up + Volume Down buttons to enter BROM mode. Conclusion This is a critical question
Create a new folder on your computer (e.g., in your Documents section).
Navigate to > Advanced options > Startup Settings > Restart . Most v139 tools include a Drivers folder
Open the extracted folder and look for the subfolder. Install the MediaTek USB Driver package. Install LibUSB-Win32 Filter Driver .
: Because these tools interact with system-level security, they are often flagged by antivirus software. It is common practice to temporarily disable real-time protection during installation, though users should only download from trusted community repositories.