should mention, the file that is trying to run when i get unrecognized fixup data is "issdfut"
I have the same issue on my HP Mini 5102
"PMODE/W: Unrecognized fixup data!"
Intel support resolved my issue.
In my bios, they suggested disabling AHCI support then change the SATA support to Legacy or Compatible. For me this translated to changing (I think it was the Sata controller option) from AHCI to IDE. Restarted my computer, firmware updated installed correctly.
After updating the firmware I went back to my bios and put it back to using AHCI.
I read somewhere in the Intel documentation that it doesn't work in IDE mode. I took the firmware update utility and put it on a bootable USB flash drive and it ran fine.