@Solla-topee Fortunately, I had a 3rd KS230 Kit and decided to try that set with the same wiring setup. That set worked perfectly the first time! It also received a firmware update as soon as it was...

@Fadam Yes, I have had the same problem. Secondary units do not work. I have tried this with 2 different KS230 KIT sets. The only time I did get 1 main switch from one of the sets working was with a...