A recoverable MVRAM Cyclic Redundancy Check error, Replace the LVPS/HVPS. See - power supply | Lexmark X264dn | Service Manual (Page 54)
How to Add or Modify an Application Using the Application List Manager for the X204, X26x, X36x, and X54x* Series MFPs Document ID:HO3695 Usergroup :External German English Spanish French Italian Lexmark X203 Lexmark X204 Lexmark X264 ...
Download and install Lexmark Lexmark X264/X363/X364 - driver id 928240