They were always particular at the forum now known as shieldlab about not posting the a d t installer code. If you get it wrong an 'error tone', press # a couple times and try again. To enter programming the ready check mark must be solid, then you hit *8 and the screen should say 'enter section'.
If you try too many codes too quickly it will lock you out for 10 min iirc.
If it's still beeping you'd need to enter something more like *20#4#6# Whenever it does its next comm test and fails the beeps will start again. Click to expand.If you go into and view each trouble and then hit # a couple times, it will silence the trouble beeps for some time even just *2# might get the job done.
