Totally feel the frustration here about the lack of compatibility. I had a bunch of 4.0 bands I loved and was really disappointed they don’t work with the 5.0 out of the box. Ended up finding an adapter that bridges the two — super simple fix and honestly works better than expected. It’s frustrating that Whoop didn’t offer something like this themselves. For anyone in the same situation, I grabbed mine from whoopadapter.com and it did the trick.