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Frequently a manufacturer will have a "series" of printers with "different" numbers on the model. It looks like in this case, Lexmark made the 640 series, and the 645 is just a "new and improved" version of the 640.

If the printer works well on this program, then this is the case. When you go online to register the product, more than likely the 640 program will auto load a patch to enable the extra feature of the 645 to the base of the 640. It is standard operations for many printer manufacturers.

Should this not be the case, then it would be advantageous to connect to the Lexmark website and get the current program specified for your printer.

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16y ago

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