This was PERFECT tipp!!!
I selected the Generic PPD driver (based on V3) - and could install: Xerox Versalink C400 PCL6 with a very new driver date: 5.810.8.ON 2021.06.03.
Now, 2 side printing is working again very well - no conflicts anymore.
But I didn't understand what is / was the root cause of my solved problem...? All drivers should work perfectly together with Win10 (64) and the Apps.
Best regards / liebe Grüße und vielen, vielen Dank, from Austria!!!😍
Hello, since some period, the duplex printing isn't possible from all Win10 Apps. I installed the different (!) drivers several times, changed from LAN to USB, etc. - nothing changed. Test page (from Win10) of the C400 tells me - "yes - duplex unit installed". Also a search in the Windows properties of the driver says: "Yes, 2 side printing is enabled".
But in each Win10-APP (thunderbird, Google, Acrobat-PDF,...) I can't change to 2-side-printing.
Device-Manager says: "Das Gerät "USBPRINT\XeroxVersaLink_C400\7&2d73aa43&b&USB001" erfordert weitere Installationen." - it needs more installations...?
Version: C400 V$ PS.
Thanks, a lot!!
Solved! Go to Solution.