Well, I just tried to install the latest firmware (TR12-126.96.36.199-5). Watching the front panel on the printer, everything seemed to go correctly, and the printer rebooted and reinitialized. However, when I checked the printer's firmware on the Information tab on the LCD, it still said TR12-188.8.131.52, without the -5.
Does this mean that the firmware did not install, or just that printer doesn't print the last digit of the firmware?
Not at all, I would look in the utility over the front panel. The front panel will probably be truncated, so let us know what the utility says.