I finally upgraded my iPhone from 6 to XS. However, after the upgrade, I could no longer get the TrainerRoad app or the Wahoo Fitness app to connect to the Kickr. On the WF app, I can see the Kickr, click on it and it just shows connecting… Never connects. On TR it never connects either. Tried rebooting, resetting, turning on and off things, etc. Initially thought my Kickr was broken but then tried my MacBook and that connected just fine.
Get my wife’s iPhone 8 and run the WF app and upgrade the Kickr firmware. After this, my iPhone XS can also connect to the Kickr properly again.
Hope that helps someone.