Mi Band 4 doesn’t connect to Xiaomi phone: full guide

Owners of smart gadgets often face a situation where the seemingly time-tested Mi Band 4 suddenly stops seeing a smartphone, especially if both devices belong to the Xiaomi ecosystem.It would seem logical to expect that the products of the same manufacturer should work in a perfect bundle, but software failures, updates to the MIUI operating system or Bluetooth module can disrupt this harmony.The user is left with the fact that the bracelet is on, the phone is on, but the data is not transmitted and notifications do not come.

The problem of lack of synchronization can be in many ways, from the banal discharge of the battery to deep system conflicts in the Bluetooth profile. Often the cause is aggressive optimization of power consumption, which kills the background processes of the Mi Fit or Zepp Life application, preventing them from maintaining a permanent connection. Understanding the nature of the error is already half the way to its successful elimination without going to the service center.

In this article, we will discuss in detail the algorithms for diagnosing and restoring communication between the activity tracker and the smartphone. You will learn how to reset the settings correctly, where to look for hidden resolutions and why it is sometimes necessary to completely remove the device from the system before repairing. A critical nuance is that for the Mi Band 4 only the Zepp Life application (formerly Mi Fit), using Mi Wear or Xiaomi Wear will lead to a connection error.

Basic diagnostics of Bluetooth and physical condition

The first step should always be to test the wireless module's performance, make sure that the Bluetooth on the smartphone is indeed activated, not just in detection mode. Sometimes the Android system or the MIUI shell can "hang" the communication module and it needs to be rebooted software.

Check the battery power on the bracelet itself. If the Mi Band 4 is discharged below 10-15%, it can go into power saving mode, in which the Bluetooth module is unstable or shuts down altogether. Connect the tracker to the charger for at least 10-15 minutes before trying to pair again.

⚠️ Warning: Do not try to plug the bracelet if it has a lightning icon or low battery indicator on its screen. First, ensure stable power, otherwise the mating process will be interrupted during the handshake stage).

For initial connection or reconnection, the Mi Band 4 and the phone must be in close proximity (no more than 1 meter). Having a large number of metal objects or working microwaves nearby can cause interference in the 2.4 GHz range.

If the physical diagnosis didn't work, try a software reset of the Bluetooth stack. To do this, go to your phone's settings, find the Bluetooth partition and force the service to stop if this option is available in your version of Android, or just turn off and turn on "air mode" for 10 seconds, this will clear the cache of network connections.

Adjusting access rights and optimizing the battery in MIUI

The most common reason why the Mi Band 4 doesn’t connect or permanently breaks communication with the Xiaomi phone is the aggressive MIUI shell energy saving policy.The system automatically shuts down applications that it believes are consuming too much resources in the background, and Zepp Life (or Mi Fit) often makes it to this list.

To fix this, you need to manually configure autostart and access rights. Go to Settings → Apps → All apps, search for Zepp Life (or Mi Fit) and go to Battery and select No Limits, which will prevent the system from killing the sync process.

• 📱 Enable the auto-run of the application in the access rights menu so that the service starts immediately after turning on the phone.
• 🔒 Allow background and geolocation access (for Android 10 and above, this is mandatory for stable Bluetooth).
• 🔔 Make sure notifications are enabled for the app itself, otherwise you won’t see system messages about connection errors.

Another important option is access to Bluetooth devices: Modern versions of Android (starting with the 12th) require separate permission to “Look for Bluetooth devices nearby.” Without this menu item, the Mi Band 4 may simply not be determined on the list of available gadgets, even if the module works properly.

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If the bracelet still turns off after setting the rights, try to delete the Zepp Life application, restart the phone, install the application again and immediately, before the first start, set all the above permissions.

Don't ignore pop-ups when you first start. The MIUI shell often asks, "Let me autorun?" or "Let me show over other windows?" The answer is "Yes" or "Allow" is critical to the stable operation of the Mi Band bundle and smartphone.

Complete discharge and re-conjugation procedure

If simple methods didn't work, a more radical approach would be needed, a complete reset of communication settings. Often, profile errors accumulate in the system that prevent a new connection. Mi Band 4 can "remember" old pairing that conflicts with the current attempt.

First, remove the device from the app. Open Zepp Life, go to profile, select your bracelet, and press Unbind. Only then delete the app. If you just delete the program, the bracelet profile can stay in the Bluetooth system.

Then go to the Bluetooth system settings of your phone. Find the Mi Band 4 (or Mi Smart Band 4) record in the My Devices list and click "Forget the Device" or "Steam" to remove the encryption keys from your phone's memory.

⚠️ Warning: Before resetting, make sure you remember your Mi Account and password. Once the bracelet is unset, the steps and sleep data are only synced to the cloud at the time of detachment. If the bracelet has not been synced for a long time, the data for this period may be lost.

Once you clear the Bluetooth cache and delete the app, reboot your smartphone, free up system resources and reset the services that are stuck. You can now re-install Zepp Life, log in to your account and start searching for a new device, at which point a vibration and a request for confirmation of pairing (a human icon or a tick) may appear on the bracelet — be sure to confirm by touch.

Software version conflicts and application compatibility

The Mi Band 4 is not a new device, and new versions of applications may not work with it correctly, or vice versa, older versions of the application no longer support the current Android security protocols.

Make sure you use the right app. The fourth model is Zepp Life (formerly Mi Fit). Mi Wear or Xiaomi Wear (for WearOS) doesn't support this tracker. Trying to connect Mi Band 4 through the wrong software will always end in error.

It's also worth checking the firmware version of the bracelet itself. Sometimes the application has a firmware update that fixes Bluetooth stack errors. If the bracelet connects but is unstable, try updating it through the device menu in the app.

In rare cases, the problem may be with the Android version.If you upgraded your phone to the latest version (Android 13/14) and the Zepp Life app hasn't been updated in a long time, there may be permission conflicts.

Specific Connection Errors with Xiaomi and Redmi

Owners of Xiaomi and Redmi smartphones can encounter unique MIUI shell bugs. In particular, the "Advanced Memory Cleanup" feature can remove the Bluetooth scanner service. There is also a known conflict when the phone "sees" the bracelet as an audio device or keyboard, rather than a fitness tracker.

Bluetooth settings sometimes help to clean the list of conjugate devices to a minimum. If there are many gadgets connected to the phone (earphones, speakers, watches, car), the module may not cope with the priorities. Try to disable everything extra and leave only the Mi Band 4.

Another specific problem is resetting time and date, and if the wristband is out of time, it may not sync because of the security certificates being out of sync, and set the correct time zone in the Zepp Life app and force the time to sync.

• 📡 Check if the Flight mode is enabled in the bracelet itself (via the More Menu -> Settings -> Airplane mode, if available through the app).
• 🔄 Change region in the Zepp Life app. Sometimes changing region from Russia to China or Europe (and back) helps to re-register a device on the server.
• 🗑️ In rare cases, a complete reset of the bracelet to factory settings through the menu of the tracker itself helps (More -> Settings -> Factory Reset, if this option is available in your firmware version.

⚠️ Warning: Factory Reset on the bracelet itself will delete all accumulated training and sleep data that has not yet been sent to the cloud.

Hardware malfunctions and repairs

If software methods are exhausted and the Mi Band 4 still doesn't connect, it may be a hardware problem.The fourth model has a "painful" plume of charging contact, which, when used frequently, can oxidize or depart, causing the Bluetooth module to work unstable due to voltage surges.

Check the contacts on the bracelet capsule. If they are blackened or coated, gently wipe them with alcohol or eraser. The oxidation of the contacts can simulate battery discharge even if the battery is charged, which leads to the radio module shutdown.

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If the bracelet does not respond to charging, does not vibrate when connected to the network and is not visible on Bluetooth, most likely, the battery or power controller has failed, you need to replace the capsule or repair the service.

It’s also worth checking the capsule on another smartphone. If the bracelet connects instantly on another phone (preferably not Xiaomi, to exclude MIUI software conflicts), then the problem is in the settings of your main phone.

In conclusion, most of the Mi Band 4 connectivity problems are solved by properly configuring MIUI access rights and the correct device detachment order. Clear adherence to the "Delete from the app -> Forget in Bluetooth -> Reboot -> Reconnect" algorithm helps in 90% of cases.