Did not help.
My HP 5740 used to work but now gives "Attention Required" message when printing. I have downloaded most recent firmware and installed it. Rebooted the printer (power and unplugged). Restarted the Windows 10 operating system. Nothing helps. The claim by an HP representative is that my printer's IP address is invalid for the public WiFi system made available to us residence in my apartment complex but I disagree since I used to be able to print on the WiFi network. Something changed, but what?