hi im having some issues with my optima xm alarm, it started off making a weird squealing noise and thought it was the battery and when i took the front off it went louder then once i had removed the battery it still continued then i pressed the reset button and what i thought was the 4 digit code it then went nuts and i mean nuts i have looked at the manual on web to reset the code but dose not have any effect as i cant remember the code for it to reset it, is there any way i can get it bk to factory settings for the original code? as for the moment i have had to unplug the speakers. Any help would be much appreciated thanks.