App useless just for printer configuration and trouble shooting doesn't really help. Worst printers ever! App loging off not allowing you to print! Printer can decide that you run out of ink even if it is not true and stop printing! Untill you switch cartridge! From time to time printer just not printing untill you unplug it from socket and turn back! Model 3755 but I think it is common for all because it is definitely software issues! Using it more than 2 years.