Lexmark 4064-210 MS821n

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

Entering Recovery mode

This mode allows the printer to boot from a secondary set of instructions and flash firmware code. While in this mode, you can only flash firmware code through a USB cable directly connected to a PC. Depending on your printer model, do any of the following:

For LED display

1. Turn off the printer.
2. Open the front door.
3. Press and hold the Stop button.
4. Turn on the printer.
5. When all the icons flash, release the button.

For 2.line display

1. Turn off the printer.
2. Press and hold the OK and Back buttons.
3. Turn on the printer.
4. When the display shows the following icon, release the buttons.

For 2.4-, 4.3-, 7-, and 10-inch displays

1. Turn off the printer.
2. Press and hold the 2, 7, and 8 buttons.
3. Turn on the printer.
4. When the display shows the following icon, release the buttons.

For 2.8.inch display

1. Turn off the printer.
2. Open tray 1.
3. Make sure that paper is loaded in tray 1.
4. Turn on the printer.
5. When the display shows the following icon, close tray 1.
   Note: If tray 1 is not closed, then the printer will boot normally.
6. A screen with red selection items appears. Touch .> to navigate to Recovery mode.
7. Touch Boot or RECOVERY.