- Wikipedia Firmware Definition: "Firmware is typically involved with very basic low-level operations without which a device would be completely non-functional. Most computer peripherals are themselves special-purpose computers. While external devices have firmware stored internally, as of 2010 modern graphics cards and peripheral expansion cards often have parts of the firmware loaded by the host system at start-up, as this provides greater flexibility. Such hardware may therefore fail to function fully until the host computer has "fed" it the requisite firmware, typically via a specific device driver (more exactly: via a start-up subsystem within a device driver package)."
Basically what Wikipedia says is that a Firmware is a software code stored in your Lexmark Printer to give it orders on how to function properly. Lexmark is continually upgrading Firmware for a better printing experience, by up upgrading you can either correct or improve your printers’ performance along with adding additional features.
How to Upgrade Firmware?
It is best to go to Lexmark own Tech Support site to get the download instructions and original Firmware.
Important! Don’t disconnect the USB cable or turn off the printer during the updating process.You need Flash Player in order to view downloading directions.
What Printers can Use this Firmware?
Along with the Lexmark S305 Printer the the S300, S400, S500, S600, Pro200, Pro700, Pro800 & Pro900 Series All-In-One Inkjet Printers can download and update their Firmware with the above link and instructions.