ST-Link V2 "USB Device Not Recognized" – Descriptor Request Failed (Intermittent Issue)

[mobaid]

Hi,

I am experiencing an issue with my ST-Link V2 debugger. When I connect it to my PC, I often receive the error: "USB device not recognized: Unknown USB device (Device Descriptor Request Failed)" and ST-LINK orange LED turns on. However, after several re-connection attempts, it works with full functionality .

Troubleshooting Attempts So Far:

• Reinstalled ST-Link drivers

• Updated ST-Link firmware

• Tried different USB cables, ports, and PCs

Any advice or suggestions would be greatly appreciated!

Thank you in advance for your support!

Best regards,
Mohamed Obaid

[Andrew Neil]

Is it a genuine ST-Link?

Standalone, or part of a dev board?

A Windows PC?

If it's intermittent, it could be a faulty/broken connector ...

[mobaid]

@Andrew Neil 
It's Standalone ST-LINK/V2 from ST  , Windows PC , Tried different USB cables, ports, and PCs
https://www.st.com/en/development-tools/st-link-v2.html