In case my Ethernet card is not recognized and it is a driver issue, Can I manually add drivers to Router OS?

no, it's not possible. RouterOS for x86 only supports the drivers from the linux kernel. we don't support adding extra drivers.

I noticed that the newer ROS version refer to a "firmware" folder (system -> ports -> Firmware). How is this used?

I noticed that the newer ROS version refer to a "firmware" folder (system -> ports -> Firmware). How is this used?

it's since v5, but not much info in manuat: http://wiki.mikrotik.com/wiki/Manual:Port#Firmware

Thanks for the answer. Have you tried this yourself? I would like to learn more about it. For instance, would I be correct in assuming that the drivers should be compiled on Debian and then copied over? If anyone has done this, I would be very interested in learning more

I noticed that the newer ROS version refer to a "firmware" folder (system -> ports -> Firmware). How is this used?

This question is answered here:
http://forum.mikrotik.com/viewtopic.php?f=13&t=70779

Regards,

Thank you for finding that for me