Dell Dimension E520 v2.4.0 Dell 2.1 SLIC

I have a Dell Dimension E520 desktop computer with (BIOS version 2.4.0) Are there any mods of this BIOS that include SLIC 2.1

Link to The Dell E520 Bios
http://downloads.dell.com/bios/DM061-020400.EXE

I know that there was a previous thread regarding the Dell Dimension E520 but those links in that thread are old and the links are dead.

If anyone can assist, that would be mucho bueno!