@André-Faria if all you want is a phone/computer side client to perform the sync, it’s a pretty straightforward process with Claude Code to build your own. Concept as follows:
Set up a bluetooth packet capture.
Perform the functions you want your app to be able to do.
Hand that to Claude Code and tell it to build an app that does that.
This, at least solves the communication protocols part. I’d love the firmware, but I bet there’s IP in there around FusedAlti that Suunto wouldn’t want to open source, even if it’s probably just a well-adapted Kalman filter. I’m going to assume the recovery functions of that watch are considered IP as well, which continues down my path of legal blockers to OS Ambit firmware.