The drive is a Compaq OEM, Compaq has no firmware updates. Liteon has released several updates, the latest was released in 2003.
Nothing I've tried will backup the firmware from the drive and nothing I've tried will extract the firmware from the YS0N flasher or patch the flasher to ignore the drive check. Digging through archive.org, it looks like XFlash 2.4.4 was the last version that'd extract scrambled firmware. There's another utility I tried that's supposed to work on scrambled LiteOn firmware but that didn't work either.
Anyone out there with a non-OEM version of this drive?