Will the 55.1 error also happen if the ink cartridges are all 4 displaying at 0%? When I do the test it is saying that they are not official cartridges. I would replace the cartridges if I was 100% sure it would resolve the 55.1 error, otherwise I would have to buy a new printer. I've updated the firmware and run print tests showing all is OK, but I've never had this '55.1 Error' when the cartridges were empty before.
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