Fitbit Firmware Update Failed — What It Means & How to Fix It

What Does This Error Mean?

The Fitbit firmware update failed to install or has been stuck for a long time. Fitbit updates transfer over Bluetooth from the app to the device — low battery, a dropped connection, or phone background restrictions are the most common causes of failure. Most failed updates can be retried successfully.

Affected Models

Fitbit Charge 6
Fitbit Versa 4
Fitbit Sense 2
Fitbit Inspire 3
Fitbit Luxe

Common Causes

Fitbit battery below 50% when update started
Bluetooth connection dropped mid-update
Fitbit app running in the background was suspended by the phone OS
Phone storage insufficient to hold the update package temporarily
Temporary Fitbit server outage

How to Fix It

Charge the Fitbit to at least 50% before attempting the update.

Fitbit will not install updates if the battery is too low. This prevents the device from dying mid-install and becoming unresponsive.
Keep the Fitbit app open and on-screen throughout the entire update.

If your phone screen turns off or you switch apps, the Bluetooth transfer may be interrupted. Keep your phone awake and the Fitbit app in the foreground.
Keep the Fitbit within 1 metre of your phone during the update.

Bluetooth range drops during large data transfers. Short range ensures a stable connection throughout the update.
If the update fails, restart both the Fitbit and the phone, then retry from the Fitbit app.

A fresh restart clears any failed transfer state and allows the update to begin again from scratch.

When to Call a Professional

If the Fitbit is stuck in an update loop and will not respond or boot, contact Fitbit Support. Fitbit can issue a replacement if the device is rendered non-functional by a failed update within the warranty period.

Frequently Asked Questions

How long does a Fitbit firmware update take?

Fitbit firmware updates typically take 15–45 minutes to transfer and install. The Fitbit app shows a progress bar during the transfer. Do not try to use the Fitbit or put the app in the background during this time.

What happens if I interrupt a Fitbit update?

If interrupted during the Bluetooth transfer phase, the update simply fails and the Fitbit continues using the old firmware. Retry the update from the Fitbit app — it will start the transfer again. If interrupted during the installation phase on the device, the Fitbit may freeze. A force restart usually recovers it.