To make a Passcode with letters instead of numbers go to Settings>General>Passcode Lock and turn off "Simple Passcode." A screen will appear prompting you to change your passcode along with a full QWERTY keyboard.
reset your ink cartridge. Another Pinner: "Ink Cartridge Low? Not true. this totally works, my printer stopped printing, saying there was no ink, I reset the cartridge and then printed 50 more documents and the ink still hasn't run out!