Need help programming Regency 4720 - lost code 0

You need to check to see if there is a 4724 module plugged into the lower left of the main board. This is a memory expansion and programming enhancement. If there is nothing there, then programming is done in hexidecimal format and can be a real bear. If there is, then you can program from the keypad more easily. To set the entire panel back to factory default do the following. First, turn off the main power switch. Second, locate the LX buss connecters just above the long terminal strip at the bottom of the board, there will be two and both are identicle. Locate the second and the fifth pins from the left. Place a short accross these pins. Third, turn power back on. Once the keypad initallizes, remove the shorting jumper.The keypad will then ask 'Default All Yes No ". press 1 for yes 2 for no. This will default ALL programming in the panel. New code will be 123456. I have been told there is no other way to default the installer code. Once defaulted, programming is best done with the computer software that works with the pannel. If you know someone that has a 5520 programmer from Silent Knight, then they can plug the chip into the pannel and read any information you need. Changes can be made at that time also.