Your right, the 6.3 remote has a switch under the battery cover beside the batteries, the 21.0 has the switch under the batteries, so it is not seen when batteries are in place.
Dan
There must already be two slightly different models, as my 21.0 has the switch under the battery cover beside the batteries.
The only difference between the 6.3 switch and the 21.0 switch is that the 6.3 switch changes from Band A to Band B, and the 21.0 switch changes from UHF to IR.
Since my 21.0 works with my 622 which is set to Band B, then I can only assume that:
- either the 21.0 only does Band B
- or the 21.0 does Band A and Band B at the same time
I tried the two-way remote download feature on the 622 (found by pressing Menu, Menu again, and then next) and it seems to be confused about TV1 and TV2 remotes (when I have the 21.0 in "TV1" mode, it complains that it is a "TV2" remote, and when I have the 21.0 in "TV2" mode, it complains that it is a "TV1" remote).
Also note that it reboots the receiver after a two-way download attempt, so be sure that you are not currently recording or plan to record within 5 minutes.