Sleep Stages isn't just for the Alta HR -- the new tracking feature is hitting all Fitbit devices with the PurePulse, so Charge 2 and Blaze owners will also receive the update. With Sleep Stages ...

If this solution doesn't work, or if you don't have access to a charger, there are other ways to attempt to fix syncing and other Fitbit Alta issues. The simplest approach is to simply close the ...