The two links below are zip files of BIOS files for the P35-DQ6 and P965-DQ6 boards. Each file contains the latest BIOS as well as one with microcodes. The non-modified BIOSes were pulled directly from the motherboards.
I have flashed the P35-DQ6 board with the modified BIOS and it seems fine.
I have not flashed P965-DQ6 yet. I had to use the command to pull the splash screen image and that allowed me to add the microcodes. Assuming I did the image file removal correctly I expect it to work but I've not tried it.
The files are on one of my servers and these are direct links:P35DQ6F9.zipP965DQ6F13.zip