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Message: [QUOTE="DTZ, post: 207318, member: 8565"] I have an ESP Office 6150. So does my neighbor. The new 10c cartridge I installed on 12/10/15 is now reported as needing replacment - code 3508 - on 2/16/2016 even though I carefully only printed black during this period. On your suggestion, I tried putting my cartridge in my neighbor's printer and got the same message. I have to conclude that the theory that the chip has a serial or code that appears new to a different printer is not valid. Also in ~ Dec 2016 I downloaded the latest version of the printer software. Now the cartidges appear to be reported as needing replacment on a time schedule. [/QUOTE]