| Problem | Cause | Solution | |---------|-------|----------| | Device disconnects after 5 seconds | Auto-exit from preloader mode | Click in SP Flash Tool before connecting phone | | Driver not found in list | Missing .inf or wrong driver version | Try LibUSB-Win32 or UsbDk as alternative | | Error 10 (device cannot start) | Driver signature or conflict | Re-disable signature enforcement; try older driver | | Device shows as Unknown USB Device | Bad cable, USB port, or device not in preloader | Change USB cable/port; remove battery (if removable) and reconnect | | Preloader mode not detected at all | Battery too low or device fully dead | Charge phone for 30+ minutes; use battery removal method |
: A transient state (usually lasting only a few seconds) when the device is first plugged in while powered off. mt65xx preloader driver
Watch the "Ports (COM & LPT)" or "Other Devices" section closely. You will see appear for 2-3 seconds and then vanish. You cannot verify it easily by just plugging
You cannot verify it easily by just plugging the phone in normally because the window is so short. Instead: mt65xx preloader driver