ADT Alegro question(s)

[kpwhite@xxxxxxxxxxxxx]

A friend of mine gave me a alegro from ADT.
The components i have are:

control panel with power cord
motion sensor (wireless)
owners manual
installation manual
key fob with controls(not using yet)

So of course i tried to hook it up without reading the instructions
DUH!!!

So, now when the alarm does go off it flashes enter code (i tried the
default installer code but no luck 4321) and another code i programed.
Also get a low control panel battery warning.

And Police flashes on display.
But i cant reset settings while it is armed (cant get it to dearm).
If i remove the back of the control panel what a hell of a noise!

Any suggestions guys?
thanks in advance.