Romanian T55

I know the Romanians upgraded some T55 to the TR85 but do they still use the baseline T55 or were all of them upgraded the to the T55AM?

They modify a lot original project to be indipendent to ussr

but did they modify all of them ?

they were building new tanks, but I think they also kept some units coming directly from russia in line

The TR 85 is not an upgraded T 55 but a completely separate tank developed from the TR 580 and 77. They still have some T 55s but they have been upgraded to AM or AM2 standard depending on which fire control system they are using either the Volna or Klavido