Direct answer
Partial sync can come from Bluetooth ownership, low battery, app permission, background restriction or account/service trouble. Keep data on the tracker while restoring the link.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleCheck tracker time/battery and whether it appears connected to another phone or Bluetooth settings outside the app.
Run the smallest isolation test
ReversibleCharge both, restart tracker/phone and grant the Fitbit app Bluetooth and background permissions.
Correct only the proven cause
ReversibleRemove stale Bluetooth pairing only as Fitbit directs; do not factory-reset before confirming cloud sync/backups.
Verify before changing anything else
ReversibleComplete sync, close the app and confirm a new short walk appears after reopening.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check before resetting anything?+
Check tracker time/battery and whether it appears connected to another phone or Bluetooth settings outside the app.
What is the safest isolation test?+
Charge both, restart tracker/phone and grant the Fitbit app Bluetooth and background permissions.
When should I stop troubleshooting?+
Preserve unsynced health data and contact support before reset if days of data exist only on the tracker.
Answer for the exact device and software version shown above.