HP LaserJet P2055dn Firmware upgrade doesn't reflect reality

The desired P2055dn_FW version of the firmware seems to be a phantom!

From this link and the Installation Instructions  tab we see a "dn" version specified, but we can't seem to download it.

Drivers & software for HP LaserJet P2055 Printer series

whereas this community site has assured us since March 2014 that the instructions are wrong:
P2055dn Firmware

The update seems to work fine and we get a happy face :-)

Firmware upgrade happy face :-)

The "P2050" is a little frightening after all instructions were all "P2055dn only" ...