T8SG Plus with FrSky S8R

Hello,
I have a Frsky S8R receiver. I would like to use this with my T8SG Plus, but the binding does not work. I tried it with the protocols FrSky and FrSkyX. At the receiver, I have bridged PIN 7 and 8 and according to instructions not pressed the F / S button. It only flashes red. When I press F / S at startup, it always goes to GREEN. Where is my mistake.
The XM + receivers all work.
Thanks for any answer that can help me.