Spreadtrum chips have a secret life . When you turn off an SPD phone and hold the volume button, it doesn't always go into "Fastboot." Instead, it enters or Brom (BootROM) mode . In this mode, the device does not identify itself as an Android device. It identifies as a generic vendor-specific device (VID 1782, usually).
: The Jungo v4 component failed to load—often because a different driver (like stock Microsoft USB driver) has claimed the device. Fix : spd sci-android-usb-driver-jungo-v4