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Want to ask first before changing the firmware - Just acquired a WF-7720 (using 27 cartridge) through grey import but at where I live only WF-7721 (using T188 cartridge) is available... Will be using genuine cartridge as I am really after the pigment ink. After making chipless is it possible to use the T188 cartridge directly? Or is it possible to flash the WF-7721 firmware?