A few weeks ago, I bought the Samsung Gear Fit 2, and because I'm a hobby programmer, I tried to make an app for it, and the making of an web-based app in Tizen Studio worked very well.
EDIT: I solved the problem. I had to create a Samsung certificate. The second problem was that I had to set the minimum Tizen version to 2.3.1 because the Gear Fit 2 does not support higher versions. And finally I was able to install the app on my Gear Fit 2.
The app is called "Calculator". When I try to install the app on my Watch, a Error shows:
Launching Calculator has encountered a problem.
Installing the package... > FailDetails:
Installing the package... > Fail
Unexpected error occurred at the below step.
'Installing the package...'
Please try again later.