Too many Rons around these parts . . . I'm changing my name to Rahn.
The new, current firmware for the PS version of the printer is indeed TR12-TR12PS_18.104.22.168. The other guy's firmware, for the non Postscript printer is the one that ends in "8". I just confirmed this with tech support.
I thought I should mention a problem that I ran into with my Printer Utility after the upgrade. For some reason, it did not show Manage Papers or Create and Install ICC Profile as options under the HP Color Center tab within the Printer Utility. Instead of six items on the list, I only had three. I also got intermittent, non functioning pop up windows with screwed up formatting for things like the Printer Queue and Printer Settings.
After a 90 minute phone call, three downloads, three installs on my own and three while on the phone with tech support, creating a new User Account on my computer and ample frustration, we finally hit on the problem. There is a small button with a printer icon and arrow in the lower left corner of the Printer Utility main window. When you click on it, it brings up a window called HP Printer Utility-Printer Selector. The printer is already my default printer and it shows up selected in the selector window, but if you hit the Select button, the missing items show up in my Utility window. The secondary popup window still show up garbled sometimes, but this routine fixes them at least for a while. This is now a known issue (at least on a Mac, with the PS utility) and they are supposedly working on a fix. Perhaps this will save someone some headache.
That's it for now,