Hi, I followed your suggestion in a general way. Today the HP support of my country called me and helped me out. I unplugged the power cable, waited 30 seconds, put the printer vertically, removed the paper tray to check for any possible piece of paper or labels, hit the printer MULTIPLE TIMES, turned the printer on while putting the paper tray back. After that, I could inexplicably be able to go on with the cartridge alignment. I also added the printer to my HP Smart and updated its firmware.
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