1. Website: - https://www.fixprintererrors.com/blog/how-to-fix-lexmark-firmware-error-900-00/https://www.fixprintererrors.com/blog/how-to-fix-lexmark-firmware-error-900-00/

4. If the device is currently displaying a 900 Firmware Error, power off the printer/MFP. Leave it powered off for 30 seconds or more to clear its memory. IMPORTANT: Do not power the printer off and on too quickly. Doing so can cause a power issue and create this type of issue.

5. If the printer is attached to a network, try plugging the printer/cable into another network port/drop point.

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