Downloading Fitbit 4.21
File size 126 MB.
The original Fitbit apk file without any modification.
How to Install
Before installing Fitbit 4.21, you have to make sure that your phone has permission to install third-party apps.
- Open your device's settings.
- Tap "Security" in the "Personal" section.
- Slide "Unknwon Sources" to "On".
- Tap "OK" to confirm your changes.
After allowing Unknown Sources, you can install the APK file of Fitbit 4.21.
- Open your "File Manager" or "File Explorer".
- Open the directory where you saved the APK file you have downloaded. (Usually in "Downloads" folder)
- Tap the APK file.
- Tap "Install".
