When attempting to run the SSD update tool with the above hardware, the tool would hang with an "Invalid Opcode" error. With the DVD writer moved to a 865G system, the tool ran just fine. However since the 865G lacked a SATA port the SSD could not be updated on that system.
After a lot of trial and error, I decided to create a bootable USB key with FreeDOS, then copied all files from the update CD to the USB key, and booted the P45 system with it. I was finally able to manually run the update tool and updated the firmware of the SSD.
I suspect the tool is incompatable with the Marvell IDE controller used by the Asus motherboard.
I hope this information is useful for development of future versions of the update tool.