-> This is for me a serious security problem, by installing software outside of official store google play, it escapes the usual security checks, so the installed application is not controlled. This is the first time I see this!
-> Once downloaded, you realize that the app requires creating an account with the application vendor. This is unacceptable.
You can still download version 3.X on google play store, the app is called smartwatch of Nwatch (not to be confused with Sony's smartwatch).
This version does not allow you to control the camera from your smartphone (but really what's the point)?
- The watch is not programmable: you can not add icons and associate them with actions.
- By cons, it is quite sufficient to read the sms, and notifications (applications, appeals) etc.
In short, for the price, do not grumble too much either ...