Entering Invalid Engine Mode - Lexmark CX825 Service Manual

Entering invalid engine mode

This mode is used if the machine has invalid code and needs the correct code loaded. After entering this mode,
the firmware code can be updated.
1
Turn off the printer.
2
Press and hold the 3, 4, and 6 buttons simultaneously.
3
Turn on the printer.
4
Release the buttons after 10 seconds.
Service menus
584
7564