Flashing RTL8111B/RTL8111C

[robinsmidsrod]

Onboard components don't usually have a separate ROM, they're all bundled inside the BIOS.

An integrated/on-board network card must usually be flashed by modifying the BIOS firmware of the motherboard. You'll need to find the appropriate tool for your BIOS, swap out the existing PXE ROM inside the BIOS image file, rewrite it (make sure checksums match) and then flash your updated BIOS to your motherboard.

This is generally something I don't recommend, unless your motherboard has a recovery function, as it can easily cause a bricked motherboard if you do anything wrong. Use chainloading instead. Most of the RTL8111s I've encountered do that quite well.