Forerunner 955 WHR and BMX version 0.0.0 WHR and BMX version 0.0.0

Have you tried to do the following:

Go to the Settings > System > About screen

Press light button (about) eight times

There then should be a screen Reinstall Software

Reinstall the software

See if that helps

https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-955-series/401804/955-sleep-tracking-is-broken-after-21-22

I had the same problem with 21.22. I'm not an expert but here is how I managed to fix mine. If u find another way please post it here so we can learn.

I tried restoring factory settings and reinstalling the software.
But 955 always show update failed.
And WHR and BMX version 0.0.0.

Then, I entered MTP mode, removed all the *.img files.
I trie the factory reset and software reinstallation again.
After several attempts, It suddenly got recognized and started working normally.
However, I still don't know what I did right or what went wrong, But for now, it's functioning properly.

Thanks for sharing it, glad it worked out for you. I didnt touch any files in the file system.