Check the listing for details. GE/Interlogix Concord 4 Installer or Master code Recovery EEPROM reading service. Condition: New. Listed at 29.99 USD. The listing is a service to get the Installer or Master code form an EEPROM if you don't think these code. So if you have an EEPROM but you don't know the code. You have to mail me the EEPROM and I can get the code out from EEPROM and mail you the EEPROM back. So you can use the Installer or Master code to change the settings of GE/Interlogix Concord. Recovers Installer and Master codes Send your Concord 4 EEPROM to me and I will crack into prom and discover what your Installer/Master codes are. Then send it back to you.No need to replace your panel when codes are lost anymore. You are responsible for safe shipping/cost to the reading service.Please do not send your chip in a standard white envelope. You can send it with more protection for the EEPROM in the bubble envelope or box.