Ensure your device shows up as "MediaTek USB Port" (MTK Port) and not "Preloader VCOM Port" when the error occurs.
Real-time protection often kills the initialization script mid-process because it recognizes the exploit as "malicious" behavior. Troubleshooting Checklist Potential Cause Faulty USB Cable Use a high-quality data cable (original preferred). Locked Bootloader Ensure "OEM Unlocking" is toggled in Developer Options. Incorrect Port Use a USB 2.0 port instead of USB 3.0/3.1. Battery Status Some devices require the battery to be disconnected. Summary of the Best Approach mtksu failed critical init step 3 best
If the device's firmware has a patched kernel or if the hardware security (SLA/DAA) blocks the script, the initialization fails. Best Solutions to Fix "mtksu failed critical init step 3" 1. Update Your Drivers (LibUSB) Ensure your device shows up as "MediaTek USB
The mtksu exploit relies on specific vulnerabilities in the MediaTek kernel. Locked Bootloader Ensure "OEM Unlocking" is toggled in
If your device has a security patch newer than March 2021, the mtksu vulnerability may be patched.