I have a brand new 4PLS, and a brand new Futaba R204GF-E RX that for the life of me, I cannot get them linked. I made sure to set my radio to S-FHSS mode, went back into TX mode, powered up the RX, and held down the link button multiple times for what seemed an eternity, still no luck. Am I doing something wrong? I followed the directions to the letter.