JLink USB is suddenly not detected in nRF52833/nRF9160 DK

[choehyunho]

Hi teams,

Recently, I upgraded JLink driver to 7.5x and suddenly all of my nRF DK boards are not detected via USB.

All of my 4 DKs shows the same symptom. LED5 near JLink FPGA chip is fast blinking continuously.

But, in device manager in Windows 10, there is no USB device is shown (even the yellow banged mis-detected/mis-configured device is not exist).

But still, my other SEGGER Jlink Base is working.

How can I fix this?

[choehyunho]

To verify USB hub problem, I removed all connected devices and clean up enumerations from my desktop.

After re-enumerating devices one by one, I confirmed nRF DKs are detected properly.

I will try to monitor whether similar problem happens again, but for now, the problem is caused by hub, not DK board.

I'll leave results if further issue exists.

Thank you.