Saturday I made the mistake of allowing my phone to install the latest software update. My fitbit logged steps all Saturday morning until I installed the update, and can't sync for the 4 days since. I've followed every suggestion I can online and nothing works. I've unstallled and reinstalled the fitbit app, power cycled dozens of times with every variation of bluetooth active/inactive and app installed/uninstalled. Rebooted my fitbit. At this point I'm convinced the problem is with my phone, but there's nothing I can do about rolling back to the last working software configuration. I can see other bluetooth connection options (my neighbor's apple TV, some laptops, but not the fitbit sitting on top of it. I tried a google search for the latest system update (N910VVRU2CQF2) to see if anyone else has had similar problems and the only posts are related to people having similar struggles connecting to what I think are bluetooth credit card scanners, all since Saturday morning.