Sony AW-G170A help with flashing firmware

Hi Guys,

I downloaded the latest firmware (1.73) for my Sony DVD drive (AW-G170A) and tried to flash it with the BinFlash GUI v1.43. However I got a checksum error. So following instructions I booted into Win XP safe mode, assuming that would put the drive into PIO mode. However this produced the same error. Does anyone have any ideas how I get my drive into PIO mode and how I flash my drive?