Within your printer there is a micro-processor and a memory chip. The Firmware is a piece of software that is loaded to a memory chip.
Error of the software has occurred, you therefore may need to flash the firmware of the printer.
Find the Firmware on the Lexmark website, be sure to get the EXACT one for your printer.
Remember a failed attempt will render your printer useless, contact a professional to flash the fimware if you are unsure.
Thanking you
damnor01
If the 900 error occurs only when the printer is receiving information from a network or computer, you should first contact your local helpdesk or your software/network support. This is because a communication issue with your network or software is indicated. If the error occurs when the printer is idle or not connected to the network or PC, however, there may be a printer hardware or connection problem. Sometimes a bad connection with an Internal Network Adapter/Network Card can cause the issue. The first thing to check is the base printer. Please click on the link below to see instructions on how to go about the procedure.
For further assistance, please call Lexmark Technical Support.
Lexmark x544 Firmware
Firmware update instructions:
Hope it helps! Good Luck!
CreativeTECH
SOURCE: I have a lexmark X544
THIS PAGE may give you more information about this Lexmark error code.
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