Hi,
I lifted this from the IFI Robotics website at
http://www.ifirobotics.com/forum/
What is the 2005 RC Master Code?
There are 2 micro-processors in the RC unit, Master and User. The Default Code(your code) is stored in the User processor. The Master processor controls all overhead controls such as radio communication. Downloading Master Code erases User Code, thus User Code will always have to be re-loaded after Master Code is downloaded to the RC unit.
Good luck,
Chuck