This has been covered before and some people have had problems getting it to work so I thought I would add my experience.
I have a Pioneer 109. I flashed with DVRupdate v09 to Pioneer’s firmware 1.55 for the A09XL using the two Pioneer files. I then used the QuietDriveUtility to increase the rip speed.
At that point my Pioneer 109 would rip DL discs at slightly faster than 12X.
I then used the same DVRupdate v09 to flash to the Buffalo 109.857 firmware to get the bitsetting that Buffalo firmware provides.
After the flash, the QuietDriveUtility was not able to recognize the drive, as expected. I then tested the rip speed with DVDDcrypter and it still maintains the 12X DL rip speed.
All the files needed for this are here: