A comprehensive troubleshooting reference for resolving Qualcomm 9008, MTK Preloader, and ADB device detection issues.
Diagnosing USB Device Driver Issues
Driver signature enforcement and conflicting legacy USB filters often prevent tools from recognizing connected test devices.
Quick Fix Steps
- Disable Driver Signature Enforcement: On Windows 10/11, restart with Advanced Options and select Option 7.
- Use Filter Drivers with Care: If using LibUSB, ensure only specific vendor IDs (VID/PID) are attached.
- Clean Device Manager: Remove phantom/ghost COM ports before plugging in the device again.
If problems persist, test with a USB 2.0 rear motherboard port to eliminate interface timeouts.
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