Well, finally I was able to pair the 21 remote but ONLY after I unpaired the original 54 remote. However on the Sys Info menu it did NOT display that the remote was paired even though it was working. Also I wasn't able to configure the TV to the remote, it says " Sorry this device is not supported by the remote control setting". Obviously, these old remotes are not fully compatible with the Hopper 3. I will have to wait for the 54 replacement remote.