Hi everyone,

I’m trying to connect my case’s front panel USB 3.0 ports to an older motherboard that only has USB 2.0 headers.

I bought an adapter (USB 3.0 19-pin → USB 2.0 9-pin), but it’s not working at all:

•   USB flash drives are not detected

•   No power / no LED activity on the device

What I noticed:

•   My motherboard header (F\_USB2) seems to have more pins than standard (looks like 10–11 pins instead of 9)

•   The adapter only covers part of the pins

•   I’m not sure if the pinout is standard or OEM

What I’ve already tried:

•   Reconnecting multiple times (correct orientation with the missing pin/key)

•   Testing with different USB devices

•   Checking that USB is enabled in BIOS

Questions:

1.  Could this be a non-standard USB 2.0 header pinout?

2.  Is it possible that the adapter wiring is incorrect/incompatible?

3.  Would repinning the connector manually fix this, or is it not worth it?

4.  Or should I just get a PCIe USB 3.0 card instead?

I can provide photos if needed

Thanks!