You Cant modify Intel Bioses , Only By inserting SLP Strings which are used for XP Activation. You cannot do SLIC Mods or unlock hidden bios options with intel boards.
Its worth the asking. SOme Intel bios have an AMI bios inside the .BIO file. With the INTEL2AMI tool, this can be removed, modded, then reinserted. You dont know which ones till you look.. Most are ITK and cannot be modded past DMI data..
If you flash it properly especially using a BOOTABLE USB Flash Drive, you should not have any problems....I have a gigabye motherboard and that is how I flashed it without a problem. Just flash it using flashspi. I know the HP Slic 2.1 works for I used it on my gigabyte motherboard and your Bios is identical to mine. If you do not know how to prepare the bootable USB Flash Drive, let me know and I will help you. I took the original BIOS and modified it with a HP Slic 2.1....I did not modify the modified bios. Therefore, it will flash fine over your present modified bios in your motherboard.