Key coding

[jman]

I recently bought Orbit to primarily register another key.
When running the key registration i get the error "Key already programmed". 

I thought that old keys could be reprogrammed?
I would be very grateful for any help or ideas.

SOLVED!
Solved by replacing the battery in the key.

I re-read this thread and apparently it is possible to re-code the key even though there is no battery left.
So for future readers: If you get a new/old key that you don't know if it works, change the battery first.