Communication issues are the key I think. The drivers communicate well enough to get things printed, quality and colour seem fine but the printer doesn't seem to be communicating back to the driver so things like paper size and type aren't reported. This isn't a major problem but it means that I have to pay more attention to margins and page layout than I'm used to, however, the GE problem is a pain. I can turn it on or off in the V4 pcl driver but choice of whole page or econo has to be made on the printer front panel. Doesn't work at all on the ps3 driver, it can be selected in Print Quality Settings but the info button next to the drop down says it will only work if the GE upgrade kit is installed - maybe the printer isn't telling the driver that GE is available. As far as I know the z3200 was never available without GE but I suppose this driver wasn't created specifically for the Z3200.
APS no longer works either, it reports the printer as "off line" (and doesn't recognize the eye one dongle either) which may be caused by the same problem.
At the moment I have it working so I am reluctant to start messing with the firmware though I do have a recent copy of a TR12 firmware (TR12-RB_16_00_00-1_mvl40-x86-opt_B.exe so same as yours Ernst I think). Is it safe to backtrack? I might try some older drivers though. Screen grab attached shows the V4 PCL driver - new look, less functionality, yay.
Thanks for the help, William.