Blackened - thank you for the offer.
Digging a little deeper I'm less convinced this is worth it.
I was puzzled by the fact that FirmwareHQ lists the Dell firmware as dating from 2009, but the Dell site says 2012. If you extract the archive, indeed the version.txt file is dated 2009. If you look at the actual Dell release notes, the only change is to address WHQL certification for Server 2008. I now suspect this firmware is actually of the same vintage as the Asus that is presently flashed in the drive.
I will be happy to post the dumps, though, later in this thread when I'm on my own PC.