My personal opinion is that the quality of this company has only been declining over the years. On my printer itself, 973x are listed as recommended for use, but at the present time, as it turned out, for some reason they are no longer supported by the printer. The support service cannot explain anything intelligible on this issue. Only recommend to write them a claim. The photo shows the cartridges that are installed in the printer. I replaced the black one, the colored ones work. However, the printer refuses to work with the new black one.