Boot an upcore over network PXE

Hi,

Having several up-core, I need to boot in PXE via my dongle usb / ethernet.

The PXE has been activated in the bios and normally my bios is up to date with the latest version.

I have tried several but none is recognized and no network is not functional.

Which USB / Ethernet dongles are functional? Can you provide a listing?

Can the PXE boot be done on any usb port?

Is there a version of bios before it works?

Thank you in advance for your return.

Thierry