RE: Spektrum DX6i no longer working - Guidance Needed
Each memory "slot" or "model memory" can only have on receiver bound to it.
So to bind a second or third receiver, start a NEW "model" configuration and once you have it set up, bind the receiver to that "slot" by first selecting the new model in the TX before doing the bind.
While facetiously pointed out, the manual talks about changing model memory slots.