Help with Striiv Activity Tracker, please.

That sounds like a pretty ambitious project that would be difficult for a novice coder to pull off even if they had access to the application's source code. It sounds like you're trying to disassemble the compiled app and make changes to it, which will be significantly harder.

"Just disable the login" sounds like a pretty simple thing when you say it but I suspect that the entire application is built around a cloud-hosted user profile. Just removing the login interaction so it goes "straight into the app" isn't going to cut it.

I hate to be the bearer of bad news, but I don't think you're going to be able to pull this off. (Nothing against you, personally - I wouldn't be able to either.)

 

Sadly, probably not. Most of these fitness trackers seem to use their own proprietary stuff rather than any sort of standardized platform, and that unfortunately means that they're pretty much impossible to support if the company stops doing it on their own.