Why Xiaomi Mi Band 4 is not connected to the phone – full diagnostics and solutions

Xiaomi Mi Band 4

Bluetooth

all-cause

Mi Fit

step-by-step

Don't rush to bring the bracelet to service: 90% of the time, you can solve the problem yourself in 10-15 minutes, the main thing is to correctly diagnose the source of the problem. We structured the material so that you can quickly find a solution to your situation, from simple actions (reboot your phone) to complex ones (flash the bracelet).

If your Mi Band 4 isn’t detected by your phone at all (not seen in the Bluetooth device list), doesn’t sync data, or connects to errors, read on. And if the bracelet stopped responding to touches after a failed firmware update, immediately go to the section about resetting.

1. Checking the basic connection conditions

Before digging deeper, make sure that the minimum requirements for synchronization are met, and users often miss the obvious points while spending time searching for complex solutions.

First, check the compatibility of the devices:

• 📱 Phone Operating System: Mi Band 4 Officially Supports Android 5.0+ iOS 10.0+. On older versions, the Mi Fit application may not install or work with errors.
• 🔄 App version: use the latest version of Mi Fit (or Zepp Life, a new name for some regions) and older versions often conflict with the bracelet firmware.
• 🔋 Bracelet charge: If the battery level is below 10%, the Mi Band 4 can disconnect from the phone to save energy.

Second, make sure that Bluetooth is on on your phone and the bracelet is within range (up to 10 meters without obstacles), walls, furniture or other electronic devices (such as microwaves) can cause interference.

⚠️ Attention: If you are using VPN Or firewalls (like Avast, Kaspersky), temporarily shut them down, and these programs sometimes block connections to wearables, perceiving them as a potential threat.

Finally, reboot both devices:

1. Turn off the Mi Band 4 by holding the touch button for 10 seconds until you feel the vibration.
2. Reboot your phone (on Android: hold the power button) → «Reboot"; on iPhone: "Switch off» → re-energize).
3. Turn on the bracelet and try to connect again.

2. Mi Fit (Zepp Life) application errors

Most of the time, connectivity issues are caused by a crash in the official app, and even if you've never changed your settings, updating the system or the Mi Fit itself could reset critical settings.

The first thing to do is reinstall the application:

• 📲 Remove Mi Fit or Zepp Life via phone settings (Settings) → Annexes → Mi Fit → Delete).
• 🔍 Download the latest version from the official store: Google Play for Android App Store for iPhone
• 🔄 Do not restore data from a backup when you first start – set up the app as new.

If reinstalling didn’t help, check the app’s permissions:

1. Open the Settings. → Annexes → Mi Fit → Permits.
2. Make sure it's on: 📍 Geolocation (required to track activity) 📱 Bluetooth (main connection) 📁 Storage (for backup copies) 🔔 Notifications (optional, to synchronize alerts)

Android 10.+ A work permit may also be required in the background:

1. Go to Settings → Applications → Mi Fit → Battery.
2. Choose No Limits or Allow background activity.

⚠️ Note: Some phones Xiaomi, Redmi or POCO Aggressive battery optimization is running, which forcibly closes the Mi Fit. Turn it off manually: Settings → Battery → Optimizing the battery → All applications → Mi Fit → No restrictions.

3.Resetting the Mi Band 4 settings

If the bracelet was previously connected to the phone but is not detected or is now in sync, hard reset will help, which will return the Mi Band 4 to factory settings and delete all data from the device.

Resetting instructions:

1. Disconnect the bracelet from the charger (if it was connected).
2. Press and hold the touch button under the screen for 15-20 seconds until the Mi logo appears.
3. Release the button, the bracelet vibrates and reboots.

Once reset, the Mi Band 4 will be ready for a new tether. Launch the Mi Fit and reconnect:

• 🔍 In the app, click Profile → Add the device.
• 📱 Select Mi Smart Band 4 from the list.
• 🔄 Follow the instructions on the screen (you will need to confirm the pairing on the phone and bracelet).

If the reset didn’t help, try an alternative method through the app:

1. Open the Mi Fit and go to the section of your bracelet.
2. Press three points (⋮) top-right → Untie the device.
3. Confirm the action and restart the bracelet.

⚠️ Warning: After resetting, all data (steps, pulse, sleep history) will be deleted from the bracelet. If it is important, try first syncing it with your phone via Mi Fit before resetting.

4.Firmware bracelet conflicts

Sometimes the Mi Band 4 stops connecting after a firmware update, either because of a bug in the new version or because of an interrupted update process, in which case forced firmware reflashing through official software will help.

First, check the current version of the firmware:

1. Open the Mi Fit and go to the section of your bracelet.
2. Press three points (⋮) → The bracelet.
3. Look at the firmware version line. Current for 2026 is 1.0.9.58 or higher.

If the version is outdated or the bracelet “hangs” on the logo after the update, perform a manual update:

• 📱 Make sure your phone is connected to stable Wi-Fi (update "weighs» ~5-10 MB).
• 🔋 The charge of the bracelet must be at least 50%.
• 🔄 In Mi Fit, go to the Device Profile → Firmware update.
• 📲 Follow the instructions on the screen. Do not interrupt the process - this can lead to the "bricking" of the bracelet.

If the automatic update doesn’t start, try an alternative method via Mi Fit. APK:

1. Download the latest firmware version for Mi Band 4 from the official Xiaomi website (support section).
2. Place the.fw file in the root folder of the phone.
3. In Mi Fit, click Firmware Update → Local file and select the downloaded file.

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If the bracelet is “bricked” (does not turn on after a failed update), do not try to sew it through third-party tools - this can permanently disable the device.

5. Bluetooth problems on the phone

If the Mi Band 4 isn’t defined by the phone at all (it doesn’t appear on the list of available devices), the smartphone’s Bluetooth module could be the culprit.

First, clear the Bluetooth cache:

1. On Android: Go to Settings → Annexes → Show system-based → Bluetooth.
2. Press Warehouse. → Clear the cache.
3. Reboot the phone.

On the iPhone, the Bluetooth cache clears automatically when you restart, but you can reset your network settings:

1. Open the Settings. → Mainstream → Reset.
2. Select Reset Network Settings (this will remove all stored Wi-Fi and Bluetooth devices).

If the bracelet is still not visible, try alternative methods of connection:

• 🔄 Flight mode: turn it on for 30 seconds, then turn it off - it will reset all wireless connections.
• 📱 Connecting via another device: try linking Mi Band 4 to another phone or tablet. If it connects, it's a problem in your smartphone.
• 🔧 Change of Bluetooth version: some phones conflict with Bluetooth 5.0. in the developer settings (Settings) → The phone. → Assembly number → 7 taps → Developer settings) try turning on Bluetooth A2DP hardware acceleration.

⚠️ Note: On Samsung phones with One UI You can use the Automatic Bluetooth Shutdown feature, which breaks the connection to wearable devices to save charge. → Connections → Bluetooth → Additionally.

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If you have Android 12+ And the bracelet plugs in, but it shuts off immediately -- add Mi Fit to the list of "background allowed" apps. → «Information» → «Battery» → «Allow work in the background».

Hardware malfunctions

If none of the software methods worked, the problem could be a physical malfunction of the bracelet or phone, and here are the most common hardware reasons:

For Mi Band 4:

• 🔋 Battery discharged or bloated: If the bracelet does not hold a charge (discharges in a few hours), the battery contacts may have oxidized or departed.
• 📶 Bluetooth module damaged: after falling or getting moisture, the antenna may fail.
• 🔌 Faulty button: if the bracelet does not respond to the presses, resetting is impossible.
• 💧 Corrosion after contact with water: despite the claim 5 ATM, Long stays in chlorinated or salt water damages the fee.

For the phone:

• 📱 Faulty Bluetooth module: If no device connects to the phone, the problem is.
• 🔌 Damaged connector (for older models with 3.5 mm or USB-C antennae).

How to diagnose a hardware breakdown:

1. Try connecting the Mi Band 4 to another phone, and if it works, it's a problem in your smartphone.
2. Examine the bracelet for physical damage: cracks on the body, traces of oxidation under the charger contact cover.
3. Check whether the bracelet responds to charging: when connected to the cable, the indicator (red or green) should light up.

If you have confirmed a hardware fault, repair options:

• 🔧 Battery replacement: costs 500–1000 ₽ Self-replacement is possible, but requires care (risk of damaging plumes).
• 📡 Repair of Bluetooth module: only in the service, price from 1500 ₽.
• 🆕 Buying a new bracelet: Mi Band 4 is still on sale (~2000–2500 ₽), But if budget allows, consider the Mi Band 7 or Mi Band 8.

⚠️ Warning: If the bracelet falls into water and stops working, don't dry it with a hair dryer or battery, it will speed up corrosion. Put it in rice or silica gel for 24 to 48 hours, then try charging. If it doesn't work, only repairs.

7. Alternative ways of connecting

If standard methods don’t work, try non-obvious solutions that sometimes help even in hopeless cases.

Method 1: Connect with Notify & Fitness (Android)

Notify & Fitness is an alternative to Mi Fit, which supports Mi Band 4 and often works where official software refuses:

1. Remove Mi Fit and download Notify & Fitness from Google Play.
2. Launch the app and select Mi Band 4 from the device list.
3. Follow the pairing instructions (you may need to enter a confirmation code from the bracelet screen).

Method 2: Use the old version of the Mi Fit

Sometimes newer versions of Mi Fit contain bugs that prevent Mi Band 4 from connecting.

1. Remove the current version of Mi Fit.
2. Download. APK 4.6.0 (stable for Mi Band 4) from APKMirror.
3. Install the file by allowing installation from unknown sources.

Method 3: Connect via iOS (if you have Android)

If you have access to an iPhone, try tying the bracelet through it:

• Download Mi Fit from the App Store.
• Connect the Mi Band 4 to your iPhone.
• Sync the data, then untie the bracelet and try to connect back to Android.

Method 4: Resetting the network on the phone

On Android, reset your network settings – this will delete all saved Bluetooth devices and reset the connection settings:

1. Go to Settings → System → Reset → Network Reset.
2. Confirm the action and restart the phone.
3. Try reconnecting the bracelet.

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If the bracelet connects through Notify & Fitness, but not through Mi Fit, the problem is exactly in the official application, in which case you can use alternative software or wait for the Mi Fit update.

FAQ: Frequent questions about connecting Mi Band 4