Hi Nazmi,

No, unfortunately I had to switch to another project. Will get back to it next month or so.
But it actually does seem specific Windows version and/or notebook and/or USB hub related.

Odd... from the description of your schematic, it should just work. I'm wondering if there's something physical going on, e.g. a bad contact or something.

It is odd. At the end of week should receive a delivery with oscilloscope and take a look at actual signals. Seems I am missing out something ...

It does this also if you plug it in with the GPIO9 button pressed?

Yes. Actually this is the only way I could get it *sometimes* to show as COM port. If already connected, resetting with EN button while holding GPIO9 button never get it recognized as valid USB peripheral. If it was recognized ...

I have a board that I designed using the ESP32-C3-MINI-1 module.

D+/D- (GPIO19/18) connected directly to the USB Type C connector (A6/B6 and A7/B7 correspondingly). CC1/CC2 have 5.1k pull-down resisters.
GPIO2 and GPIO8 is pulled high with separate 10k resisters. GPIO9 is pulled high and is ...