Ah, yes - but I am currently trying to extract an answer from Razer as to whether or not this mouse can be damaged by an incorrect firmware update process. They are still referring me to Microsoft.
Any product can be paperweighted by a bunked firmware install. A few rare motherboards have a backup ROM with the original firmware that can be restored in case of a critical failure, but in general you are screwed if a firmware update goes wrong.
In short: Never, EVER update a products firmware, unless you know for certain that the update fixes an existing problem that you personally are running into.
(I've killed two devices through a firmware upgrade myself: a Pentium 3 motherboard that passed all checks, yet never booted up again after the install completed, and a Linksys wireless router when I lost my (cabled) connection half-way through the flash process.)
For the most part though, a mouse is a mouse is a mouse. I have a microsoft wheelmouse optical, and also had a wireless microsoft mouse, and never bothered to install any software (including the intellipoint driver CD that came with the mice) yet they work fine.