Firmware is the internal software that runs Xiaomi Mi Smart Band 4. Updates are delivered through the compatible companion app on Android and may improve stability, compatibility, language support, or existing features.
How Updates Work
Three parts are involved when the band receives an update:
- Xiaomi Mi Smart Band 4: receives and installs the firmware. During installation, the display may show update progress and the band may restart automatically.
- Companion app on Android: checks for a compatible package, downloads it, and transfers it to the band over Bluetooth.
- Device profile and account: help the app identify the paired band and the software offered for its model or configuration.
The normal update flow is handled inside the companion app. There is no need to manually copy firmware files to the band or connect it to a computer.
Before Updating
[checklist] * Band has enough battery; keep at least about 20% available and preferably more for extra margin * Android phone has enough battery or is connected to power * Bluetooth is enabled * Band is kept close to the phone * Internet connection is stable while the update package downloads * Companion app can remain open while the update is running [/checklist] [tip] Keep the band beside the phone rather than carrying either device into another room or placing it inside a bag during the update. [/tip] [warning] Avoid starting an update when either device is close to powering off. Do not intentionally disable Bluetooth, close the companion app, or move the band out of range while firmware is being transferred. [/warning]Check the Version on the Band
The installed firmware version can be viewed directly from Xiaomi Mi Smart Band 4.
[step] 1. Wake the band display. 2. Open the Settings or More area, depending on the installed software. 3. Open Settings. 4. Select About or the equivalent device-information option. 5. Find the firmware version shown with the device information. [/step]The firmware number is normally shown as a series of digits separated by dots. You mainly need it when checking whether an update changed the installed version.
Check the Version in the Android App
Firmware information can also be viewed from the paired-device screen in the compatible companion app.
[step] 1. Open Mi Fit or the compatible Zepp Life app on the Android phone. 2. Open the Profile or device-management area. 3. Select Xiaomi Mi Smart Band 4 from the paired devices. 4. Find Firmware version, Device info, or the equivalent entry. [/step]The version shown in the app should correspond to the version installed on the band.
Check for an Update
The companion app normally checks the band's software when the devices connect and synchronize. If a compatible update is available, the app may display an update prompt or an update control on the device screen.
- Keep Bluetooth enabled and the band nearby while checking.
- Allow the app to finish syncing with the band.
- If an Update or Firmware update control is available, open it to see whether a newer compatible version is offered.
- If no update is offered, there may be no newer package currently available for that model, region, or app configuration.
Install an Available Update
What an Update May Change
The contents of each release can differ. Firmware updates for Xiaomi Mi Smart Band 4 may include changes such as:
- Bug and stability improvements.
- Changes intended to reduce synchronization or connection inconsistencies.
- Performance refinements for menus and normal device operation.
- Adjustments to existing activity, heart-rate, notification, or vibration behavior.
- Language, font, or character-display changes.
- Compatibility improvements related to newer companion-app or Android releases.
An update does not guarantee that every behavior will change. Some releases may contain only small internal improvements.
App Version and Firmware
The band firmware and its companion app work together. Keeping the Android app reasonably current helps it recognize available firmware and communicate correctly with the band.
- Update the companion app through the Android app store when an appropriate update is available.
- Let the band synchronize regularly so update prompts can appear.
- Install band firmware when you have enough battery, a stable connection, and time to let the process finish.
Model and Region Differences
Xiaomi Mi Smart Band 4 was available in different variants, including versions with different hardware features in some markets. Firmware offered to one variant or region may therefore differ from another.
- Use the firmware offered through the compatible companion app for the paired band.
- Do not assume another Mi Smart Band 4 variant should have the same version number.
- The app normally handles compatibility rather than asking you to choose another variant's firmware manually.
- After moving to another Android phone, pairing the same band with the appropriate account and companion app should still allow compatible updates to be offered.
If the Update Does Not Complete Normally
[troubleshoot] Problem: Update progress appears to stop Cause: The Bluetooth link may be weak, the devices may be too far apart, or the transfer may simply need more time Fix: Keep the band close to the phone, leave the app open, and allow additional time. If the app clearly stops the process, restart the phone and band before checking for the update again. Problem: The band reports an unsuccessful update attempt but still responds Cause: The transfer or final synchronization may have been interrupted Fix: Make sure the companion app is current, reconnect the band, and allow the app to synchronize. If an update is offered again, repeat it with the devices close together. Problem: The band does not reconnect after an interrupted update Cause: The Bluetooth or app connection may not have resumed normally Fix: Toggle Bluetooth off and on, reopen the companion app, and restart the phone if needed. Re-pairing can be considered only after simpler checks because unsynchronized local data may be affected. Problem: The band remains unresponsive Cause: Battery level or an interrupted software process may be involved Fix: Leave the band connected to its charger for a while, then attempt a normal reconnect. If it remains unresponsive, further device-level assistance may be required. [/troubleshoot]Confirm the Update
After the band reconnects, verify the installed version from either device.
- On the band: open Settings > About or the equivalent information screen and note the firmware version.
- On Android: open the paired Xiaomi Mi Smart Band 4 device page and find its firmware information.
The values should correspond after synchronization. If the app still displays an update prompt, allow another sync or restart both devices before checking again.
When to Update
[compare] Good time to update | You are at home or another stable location, both devices have enough power, the network is reliable, and you have time for the process to finish Reasonable time to wait | You are about to travel, depend on the band for an important activity, or cannot keep the phone and band together until the update finishes [/compare]If you postpone an update, check again later rather than ignoring update prompts indefinitely. Future releases may contain compatibility or stability changes relevant to the companion app or Android environment.
Firmware Update vs Factory Reset
[compare] Firmware Update | Installs or replaces internal software and normally keeps the existing pairing and already synchronized account data Factory Reset | Clears local band settings and data and normally requires the band to be paired again [/compare]Data that has already synchronized to the companion app or account is separate from information still stored only on the band. If a reset is being considered, synchronize first when possible.
A firmware update is the normal choice when the companion app offers a software release. A factory reset is a separate action intended for situations such as preparing the band for another user, changing its account setup, or clearing its local configuration when that is genuinely necessary.
Long-Term Update Basics
- Use the compatible Android companion app as the main place to manage Xiaomi Mi Smart Band 4 software.
- Synchronize the band regularly so device information and update availability can refresh.
- Run updates with sufficient battery, a stable network, and a close Bluetooth connection.
- After an update, check important preferences such as notifications, workout settings, language, and units in case an app or firmware change affected them.
- Keep access to the account used with the band so pairing and synchronization remain easier when moving to another Android phone.