If either '1234' or '8390' will not work, then we can conclude that it must be a unit pre-programmed with a custom password. Certain programmers (eg. A&E, Hallmark, Scripps, etc.) have units with custom passwords. In these cases, the only option is to work with the programmer to have the unit unlocked. This may either be accomplished via the satellite signal, or the programmer may be able to reveal the custom password. Cisco is not at liberty to disclose these passwords. In order to determine if you have one of these units, please contact Support at email@example.com and provide the UA/TID number of the unit.