When a smartphone suddenly stops detecting a fitness tracker, it can take anyone by surprise. Especially when you just charge a device or try to sync data after a long break. The problem when the phone does not see the Xiaomi Mi Band 4 bracelet is quite common and can be caused by a variety of factors, from the banal discharge of the battery to software failures in the Android or iOS operating system.
In most cases, you should not panic, because hardware failure of the Bluetooth module is rare. Much more often, temporary software glitches, accumulated application cache or firmware version conflict are to blame. To bring the tracker back to life, you need to consistently check the settings of wireless interfaces, the state of the bracelet itself and the correctness of the Mi Fit (now Zepp Life) or Mi Fitness application.
The following article contains a step-by-step algorithm to help diagnose and fix the malfunction. We will look at both standard reconnection methods and more complex scenarios that require a complete reset. Follow the instructions carefully to avoid losing data about your activity.
Basic diagnostics of Bluetooth connection
The first thing to do if the phone doesn't see the Xiaomi Mi Band 4 bracelet is to check the status of Bluetooth. Often users forget that the wireless module may have turned off as a result of energy savings or accidental pressing. Make sure that Bluetooth is not only on the notification curtain, but also active in the main settings of the system. Sometimes the curtain shows the state on, but the module itself freezes.
Try doing what's called a soft reset of the Bluetooth adapter. Turn it off, wait 10-15 seconds and turn it on again. At that point, the tracker screen should light up, signaling a search attempt. If the bracelet screen is black, it may just be discharged or gone into deep sleep. Put the device on charge for at least 10 minutes.
⚠️ Warning: If you've previously connected the bracelet to other smartphones, make sure they have Bluetooth off or the device removed from the conjugated list. Mi Band 4 may try to dodge with the old owner, ignoring the new phone.
It’s important to distinguish between connecting via the Bluetooth system menu and binding in the app. Data synchronization is done exclusively through the app, not through the phone’s standard settings menu. If you see your tracker on the list of available devices in Bluetooth settings, but it doesn’t connect, that’s a good sign that the hardware is working.
Compatibility check and application version
One of the most common reasons why the phone doesn't see the Xiaomi Mi Band 4 bracelet is because it uses inappropriate or outdated software.The Xiaomi ecosystem has gone through several transformations, and older versions of apps may just not be "friendly" with newer versions of Android or iOS.The main app has long been Mi Fit, which was later renamed Zepp Life.
If you use third-party aggregator apps like Notify for Mi Band or Mi Bandage, they require that the main application (Zepp Life) be installed and operated correctly. Check on Google Play or the App Store for updates. Sometimes developers release patches that fix critical BLE (Bluetooth Low Energy) protocol errors.
- 📱 Make sure you have a Zepp Life app (formerly Mi Fit) or Mi Fitness installed, depending on the model.
- 🔄 Check for updates to your smartphone’s operating system.
- 🔐 Give the application all the necessary permissions: geolocation, Bluetooth, notifications and background access.
Special attention should be paid to the permission to access geolocation. On Android, starting with the 6th version, for the Bluetooth scanner to work (device search) must be turned on. GPS-Without it, the phone won't be able to physically detect nearby devices, even if Bluetooth is active.
💡
If you use an iPhone, check your privacy settings. The "Bluetooth" section for the Zepp Life app must allow access, otherwise the device search will be blocked by iOS.
Reset Xiaomi Mi Band 4 bracelet to factory settings
When standard methods fail and the phone still doesn’t see the Xiaomi Mi Band 4 bracelet, the (most effective) way is to completely reset (Hard Reset), which clears the tracker’s internal memory of temporary files, cache and erroneous pairing settings.
You can reset in two ways: through the brast menu itself, or through the app. If the menu on the screen is available, flip to "Settings", then find "Factory Reset" and confirm the action with a vibration. If the menu does not respond, you will have to use the application.
☑️ Checklist before reset
Once you reset, the Mi logo will appear on the screen and you'll be asked to select a language. Don't try to connect right away. First, remove the device from the Bluetooth list in your phone settings (if there is one), and untie it in the app. Only then start searching again.
| Resetting method | Difficulty | Data retention | Implementation time |
|---|---|---|---|
| Through the wristband menu | Low. | No (data will remain in the annex) | 30 seconds |
| Through the Zepp app | Medium | No (synchronization required) | 1-2 minutes |
| Zero discharge | Low. | Partial | 3-5 days |
It is important to understand that the reset does not delete your historical steps and sleep data if it has already been synced with your Xiaomi cloud account. However, local data that has not yet been sent to the server will be lost.
Working with access rights and energy saving
Modern Android shells (MIUI, OneUI, EMUI) aggressively control power consumption, often killing background processes that are deemed unnecessary. If the phone can’t see the Xiaomi Mi Band 4 bracelet, it may have simply banned the app from running in the background.
You need to go to the battery settings and find your fitness app there, set "No Limits" or "No Limits" mode, and check autostart: it must be on, without which, after you reboot your phone, you won't be able to reconnect to the tracker.
⚠️ Attention: On Xiaomi phones (MIUI) Often you need to enable autorun in a separate system application "Security" ->"Permits" ->"Autostart. Without this step, the system will block the connection.
Another critical point is permissions. The app needs location access (GPS) all the time, not just when you're using. If you've chosen "Only during use," the device search in the background won't work. Go to Settings → Apps → Zepp Life → Permissions and check all the items.
Hidden Developer Settings
Profile removal and re-association
If none of the above has worked, the device profile in the phone or app database may have been damaged, and the phone will "remember" the old encryption keys that are no longer relevant to the bracelet, in which case you must completely "forget" the device.
Go to Bluetooth system settings, find Mi Band 4 and click "Forget device" or "Unpair." Then open the Zepp Life app, go to profile, select your bracelet and click "Unpair." Only after you have done both, you can start the search again.
The re-binding process looks like this:
- Turn on Bluetooth and GPS.
- Open the app and go to profile.
- Click Add Device and select Mi Band 4.
- When the vibration and icon appear on the bracelet screen, confirm the pairing.
Sometimes it helps to create a new Xiaomi account or sign in through an alternative authorization method (for example, through Facebook or Google), but this is an extreme measure.
💡
The key point of successful pairing - the bracelet should be in a standby state (screen with a screen). QR-code or vibration) when searching through the app, not through the phone’s Bluetooth settings.
Hardware malfunctions and module replacement
If the phone doesn’t see the Xiaomi Mi Band 4 bracelet even after resetting and flashing, the Bluetooth module inside the capsule may have failed, which can happen after a fall, moisture (even if IP68 protection is declared, leakage is broken over time), or a voltage surge when charging.
You can test this by trying to connect to the bracelet from another smartphone, and if no phone within a 10-meter radius detects the device, and the bracelet itself turns on and responds to touch, there is a high probability of hardware death of the communication module.
- 🔋 Check the contacts of the charger – oxidation can give a false feeling of work.
- 💧 Inspect the case for microcracks where sweat or water may have gotten.
- 📉 A sharp drop in autonomy (from 100% to 0% in a couple of hours) often precedes a module breakdown.
The Mi Band 4 capsule is virtually non-repairable, as it is indissoluble. If the module is confirmed to break, it is cheaper and easier to purchase a new capsule (without a strap), which is inexpensive.