This is my case. I just receive my new epson p600 with ciss. I downloaded the printer driver and i was accidentaly update the firmware version. When i power on the button, it says ink not recognized. So I bought firmware key. The firmware was succesfully installed to my printer. When i press the power on, the error message disappear. And i was happy. This is my problem now, when i started to do printing job, the error ink cartridge not recognized came back. This happens only when the printer started to perform the printing. Pls help me this fix. Thanks