finally it seems to work ... I was really worried when I inserted the cartridges instead of original Epson cartridge XP800, my printer has detected that it was not original cartridges and informed me of a message that appeared blocking me. And finally no, no blockage, she accepted and so far no problem. I just hope it will not clog faster than original cartridges heads but it is a risk worth taking when you have to save on the price, which is more reasonable than the original ones anyway .. .