The BIOS was quite a bit more complicated and there was a few options that I had available to try, all of which require either Windows or DOS environments. I don’t have any legal copies of Windows to put on my server and didn’t want to go through all that effort`

It really needs to be done within a DOS environment. I downloaded the file PEC6100BIOS017000.exe from Dell’s support website (locally hosted copy) as well as the 2.88Mb version of FreeDOS (locally hosted copy).