Hi,
I just moved into a new home with a FBII XL-21 alarm system. Previous owner didn't leave me any information about the code and the alarm company that they used no longer in business.
I have tried reseting the system and was able to reset the master user code. However, I can't program the alarm because the default installer code doesn't seem to be working. Perhaps it has been changed or being locked out using software. Is there a way that I can override the previous installer code or reset it?
Your help is greatly appreciated.
attica