now turn off your phone, and turn it back on by holding ALL THREE together: Vol up, Vol down, and power - keep them pressed until you get to fastboot mode
phone should say start with android on his back btw
download that, that's 4.04 with root access - so you can test out if you want root, since i can't find the truly stock 4.04, and this will give you an easier option.
if you really dont want root, ill continue looking for the true unrooted stock but this is the same thing but better.