firmware/software upgrade is also required, unless you're trying to just rig it temporarily by running white through your black line and setting print values manually. this would also require you to swap the chips, as your printer wouldn't simply allow you to insert a white cartridge and go. you'll essentially need to trick it, unless you redefine its parameters via updated software.
also, when white ink is inside of the printer, it requires increased cycle times or the ink settles and ruins the printhead/ink lines. which is resolved with software upgrade. i wouldn't suggest the "rigging it"-method unless you plan on flushing/filling/printing/flushing/resetting right away.
