A blue screen with a "Firmware Error [900.00]" appears on the printer display during a scanner operation; either when the scanner calibrates upon power up or when making scans or copies.
Update the printer firmware with the latest version, the correct scanner error code will be posted by the printer, instead of the 900.00 Firmware Error.
Note: Refer to Checking the latest Lexmark printer firmware for steps on how to update the printer firmware.
Verify if the issue is with the automatic document feeder (ADF) or flatbed scanner.
Disable ADF scanner.
Check if the issue persists:
LEGACY ID: SO8804
900 error occurs when scanning from the Scan Center app
417.33 mailbox transport error for devices with super finisher