Now I could be wrong, but my understanding that anything that runs TR2 inks (upgraded VG, VG2, VG3) has the service mode locked out. You can still perform basic maintenance tasks, but advanced procedures are locked out. I have a VG that runs firmware 3.10, but thus far have been avoiding upgrade to TR2 (firmware 4.50) due to the impending loss of service mode it would entail. I don't use the advanced features of service mode often, but have been tossing around the idea of losing them so that I no longer have to sweat the dwindling supply of white ink. I just worry that if I give it up, then I will surely have a need to read out that sensor voltage!