This is almost always a driver issue. Reinstall the MTK USB drivers and try a different USB port (preferably USB 2.0).
On your phone, go to and tap "Build Number" seven times. Then, go to Developer Options and enable: USB Debugging OEM Unlocking Step 3: Connect to MTKRoot mtkroot v26 repack
No more hunting for obscure VCOM or Preloader drivers; they are often included in the installer. This is almost always a driver issue
This is almost always a driver issue. Reinstall the MTK USB drivers and try a different USB port (preferably USB 2.0).
On your phone, go to and tap "Build Number" seven times. Then, go to Developer Options and enable: USB Debugging OEM Unlocking Step 3: Connect to MTKRoot
No more hunting for obscure VCOM or Preloader drivers; they are often included in the installer.