Mtksu Failed Critical Init Step 3 Best | ((free))Ensure your device shows up as "MediaTek USB Port" (MTK Port) and not "Preloader VCOM Port" when the error occurs. If the software-based exploit fails at Step 3, the device's security may be preventing the "handshake." mtksu failed critical init step 3 best If your device has a security patch newer than March 2021, the mtksu vulnerability may be patched. Ensure your device shows up as "MediaTek USB |