Does the AR8000 you have say DSMX on the label or DSM2? It is possible you have an AR8000 from pre-DSMX announcement and it and the remote have a DSM2 case/label. Always check the backside of your DSM2 remotes to see if there is an X along with the numbers on the label. If there is an X it is actually a DSMX remote in DSM2 clothing. If you get them all in a bin and get them mixed up like I do its easy to lose track. Look for the X on any DSM2 remote to confirm it may actually be DSMX.
All AR8000s are DSMX regardless of what the label says.