I just went through this with a 6400. It called for print head replacement and after the install immediately asked for a waste tank replacement. Since I didn't have one, it was 4 days before I continued the process. After installing the tank, the printer asked for 3 new ink cartridges, which I assume had been emptied filling the head. After installing the ink, the printer functions normally and fortunately is not asking for anything else so far. I had no indication that the process aborted and started over, so likely you're OK.