mig...the RKA works for me 99 times out of a hundred. I turn on my bike and let it settle in for about a minute before I turn on the Sena. Then it takes a few seconds for the SENA to connect, but almost always does. When it doesn't, I go to the Bluetooth screen on the bike, go to helmet 1. Before I select helmet 1, I push the SENA button, not the jog dial, until it starts beeping. Then I select helmet 1 on the bike and wait for it to show SENA. Then I select SENA and all is well.
Try the RKA method again, get it all synced, then try what I described