how can I enable interfaces?

Hi, I have installed 2.9.x Router os to pc, but erhetnet is not working… How can I enable ethernet interface?

in 3.x it is working. I think problem is in ethernet card, that’s 1GbE one. But I don’t want to use 3.x because my radius billing software is not compatiable with that.

RouterOS 3.x has added hardware support. Your NIC will probably not work with 2.9.x.

How can I install driver for that? I can use external ethernet for that, but I want 1GbE, mainboard’s onboard card.