Disclaimer: Modifying your device's low-level software can permanently brick hardware. This guide is for educational and professional repair purposes only. The author assumes no liability for data loss or hardware damage.
: On Windows 10/11, you must typically disable this security feature via Advanced Startup Settings (Restart + F7) to allow the installation of unsigned MTK drivers. Add Legacy Hardware : driver mtk brom vcom hot
If standard VCOM fails, use to filter the device: : On Windows 10/11, you must typically disable
| Error Code / Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | | Windows is blocking unsigned drivers. | Reboot and re-disable signature enforcement. Check if Secure Boot is off in BIOS. | | Driver installs, but phone doesn't connect | USB 3.0 interference or bad cable. | Switch to a USB 2.0 hub. Use a short, thick cable. | | Device appears for 1 sec, then disappears permanently | This is NORMAL behavior for a "Hot" BROM. The phone exits BROM if no flash command is sent. | Load your scatter file in SP Flash Tool and click "Download" BEFORE plugging the phone in. | | "BROM ERROR: S_BROM_CMD_STARTCMD_FAIL" | The driver is correct, but the handshake failed. | Reboot PC. Disable antivirus (it blocks COM port injection). | | Device shows as "MTK USB Port" without COM number | You installed the wrong driver (CDC Serial instead of VCOM). | Uninstall the device (check "Delete driver"). Reinstall using the "Have Disk" method for VCOM. | | "Hot" driver conflicts with "Cool" driver | You have both PreLoader and BROM drivers installed. | In Device Manager, disable the "PreLoader USB VCOM" driver when you need BROM (and vice versa). | Check if Secure Boot is off in BIOS
To successfully install VCOM drivers, you must temporarily disable Driver Signature Enforcement
The absolute lowest level of the chip. It is read-only code burned into the silicon that executes the moment you power on the device. It acts as an emergency fail-safe.