I have a C75 device with a Fiery external controller.
Until now I used it only with tray 5. Now I add dual OHCF.
OHCF is working, I can copy from tray 6 & 7, but when I want to print from those trays I haw always error. Fiery wants to print from tray 1 or 5.
In device center in Fiery i se in instaled option tray 6 and 7 (oversized). I can chose it in job propertis. I have no idea why it's problem with printing.
I have rainstal Fiery (and instal all updates), update machine software, even NVM inicialized.