Versa won't sync after firmware update.

[Sonntay]

I updated the firmware on Monday and my Fitbit hasn't been able to sync since before the update.

[Rich_Laue]

Phone model? 

[Sonntay]

Galaxy S8

[Rich_Laue]

Have you checked the Android help docs 

The sync help

Also try clearing the Fitbit app cache. 

Also Swipe the app out of memory. Then thorough the phones setting stop the app then clear the cache 

[StPauliAmi]

There appears to be a serious issue with 3.18 and 3.19. While it manifests slightly different on different phones, it prevents devices from syncing with the app. On mine (which I keep reporting on different threads and with customer service), I have a No Internet Connection notice, which I clearly have because I am currently using my phone to type this. No one in these threads is addressing the core issue and people from Fitbit keep citing the same restart information that doesn't help. It is frustrating.