I have a Lexmark x2600 all-in-one printer (printer/scanner). It's worked perfectly fine for the last couple years I've had it. I had to replace the cartridges in it ONCE since I've owned it, and I went with Sophia Global knockoff cartridges, which worked fine. It's now time to replace the cartridges, only THIS time, I'm using brand name cartridges. The printer is telling me that these cartridges are incompatible with the printer. When I put the empty cartridges back in the printer, it recognizes them just fine, but since they are empty, they aren't much use to me. I can only assume that the knockoff cartridges had some kind of malware coded into them to rewrite the printer's firmware to only accept their brand of cartridges. I've tried new brand name cartridges from a few different sources and I've gotten the same results, so it's not likely that I bought bad cartridges. Any idea how to fix the problem?