The red master key is required to program new black keys into and out of the system. Without it you will not be able to program a new key.
Lost the red master key see below....
Apollo 780 master key
Lost the red master key for the Apollo 780. It is now possible to code in a red master key and restore the full capabilities of the Apollo 780 transponder immobiliser. Once coded it can be used to program standard black slave keys & operate the immobiliser as a coded key.
Apollo 2002 Replacement Socket
Replace worn out or broken 2002 socket with this easy fit replacement item