That manual is the Users Manual, it will come in handy but you need the Installers Manual. I will send you a Private Message with downloading instructions.
My mistake, I’m sorry, the instructions given at the link I sent you are for newer series panels.
1. Remove all power, AC and battery, from the panel.
2. Short the pads on the panel labeled EEPROM RESET.
3. While maintaining the short, power-up the panel and wait for at least 10 seconds before removing the short.
4. Upon removal of the short, the keypad buzzer will beep and the panel will be reset to the factory default values.
Hopefully it will work a little better.