Thanks. But it is not there.... Perhaps I have old sw
Actually, you're not changing the DVR, but the remote.
Wander through the remote setup menu in the DVR, and you should find the option for programing AV1 & AV2.
1. AV1 or AV2
2. press and hold MUTE & SELECT for two blinks
3. enter 0 0 0 0 1
4. press and hold MUTE & SELECT for two blinks
5. enter 9 6 1
6. press CH down
7. press SELECT