The problem is still actual. I've found a similar request here. Thanks for sharing such great solution.
A heads up.
Just did a clean install of Windows 10 v1903 on a desktop PC. Windows recognised the FX P265 dw printer and installed generic drivers.
When I went to print, everything came out negative/inversed (white on black background - real toner killer, eh!) Didn't matter the type of file or what program, always the same.
After an hour or so attempted troubleshooting, nothing solved but had the brilliant light-bulb moment .... delete the device from Windows 10, kill the Windows 10 drivers and install a current driver downloaded from FX.