Clay

Somewhere in this thread there was a posting explaining that the code to erase a device key was 992. And, clearing a button was 994. I comes from an explanation from One For All, and it was also posted by [Link: mandala.com].
Anyway, the sequence seems to be:

Clearing A Device Key
1. Press the key you want to clear.
2. Press the P key until the LED blinks twice.
3. Press 9 9 2.
4. Press the device key twice.

Clearing a Button
1. Press the device key the button is assigned to.
2. Press the P key until the LED blinks twice.
3. Press 9 9 4.
4. Press the button you want to clear twice.

I hope this is helpful and correct info.