I know this is an old thread, but I need some help. I recently purchased a very nice 12z transmitter, and am trying to change the user name. It keeps going to a screen asking for a 4 digit ID number. How can I reprogram this number, or get. Around it? Wish there was a "12z for dummies! I only need to use the basic functions, as well as a couple mixes for my Jets. Bought this because it looked to program similarly to my old 10c,