Synchronizing your smartwatch with your Xiaomi 4 Smart phone via Bluetooth gives you access to notifications, health monitoring, and music control right from the wrist. However, many users face problems: devices can’t find each other, connections are broken, or functions are not working correctly. In this article, we will break down the step-by-step connection algorithm, look at common errors, and give recommendations for optimizing communication.
Xiaomi 4 Smart features Bluetooth 5.0 protocol support, which provides stable connection at a distance of up to 10 meters. But even with modern standards, it is important to properly configure both devices. We will take into account the nuances for different versions of Android (8.0 to 14) and watch models from Mi Band to Amazfit.
1. Preparing the Xiaomi 4 Smart phone for connection
Before syncing, make sure your smartphone is ready to work with wearables, starting with checking the key parameters:
- 📱 Android Version: Update to the latest available version via Settings → The phone. → System Update. For stable clocks requires Android 8.0 or newer.
- 🔄 Bluetooth module: Activate it in the Quick Settings panel or through Settings → Connections → Bluetooth. Make sure that Visibility for All is on 2-3 minute.
- 🗑️ Cache and data: If other watches have previously been connected, clear the Mi Fit or Zepp app cache in Settings → Annexes → Application management.
- 🔋 Battery charge: The phone's charge level should be at least 30%, and the hours - not less than 50.
Important: If you have optimizers on your phone (like Clean Master or DU Battery Saver), temporarily turn them off. They can block the background Bluetooth activity needed for a stable connection.
⚠️ Note: Some Xiaomi firmware (for example, MIUI 12.5) Bluetooth Auto Connection is disabled by default. To activate it, go to Settings. → Connections → Bluetooth → Additionally. → Autoconnect and switch on the switch.
Installation and configuration of the official annex
The watch requires a proprietary app to work properly, depending on the model of the device:
- 📲 Mi Band 3/4/5/6/7 → Mi Fit (download to Google Play)
- 📲 Amazfit GTS/GTR/Bip → Zepp (formerly Mi Fit for Amazfit watches)
- 📲 Redmi Watch → Xiaomi Wear or Mi Fitness
After installation, follow the following steps:
- Open the app and sign up (use a Xiaomi or Google account).
- Click "Add device" and select your watch model from the list.
- Follow the on-screen instructions to confirm permissions to access contacts, notifications, and geodata.
- Enable “Permanent Notification” for the app in your Android settings so that the watch receives alerts without delay.
If the app doesn't see the watch, restart both devices and search again. On Xiaomi 4 Smart with MIUI 13+, you may need to disable the Battery Optimization feature for the watch app in the Settings menu → Apps → Permissions → Special Permissions.
☑️ Preparation for connection
3. Step-by-step clock connection via Bluetooth
Now, to the synchronization process itself, the instructions are universal for most models, but we'll give you some nuances for specific devices.
Step 1: Activate the pairing mode on the clock:
- For Mi Band: Click on the touch button of the watch before the "Pair" or Bluetooth icon appears.
- For Amazfit: Press the side button for 3 seconds until the indicator blinks.
- For Redmi Watch: Swipe up the screen and select "Plug phone".
Step 2. Search for the device on the phone:
- Open Settings → Connections → Bluetooth on Xiaomi 4 Smart.
Step 3: Completion of the setting in the application:
- Return to the app (Mi Fit/Zepp) and wait for the automatic connection.
- Update the firmware of the watch if the app offers to do so.
- Set up synchronization of notifications, pedometers and other functions in the Device Profile menu.
| Model clock | Required version of Android | Annex | Features of connection |
|---|---|---|---|
| Mi Band 7 | Android 6.0+ | Mi Fit 4.6.0+ | Requires AutoRun permission in MIUI settings |
| Amazfit GTS 2 | Android 7.0+ | Zepp 5.10.0+ | Supports dual connection (to phone and PC) |
| Redmi Watch 2 | Android 8.0+ | Xiaomi Wear 1.5.0+ | You need to turn off the energy saving mode for the application |
| Haylou Solar | Android 5.0+ | Haylou Fun | The pairing takes up to 2 minutes due to slow data transfer |
⚠️ Note: If the watch is connected but not synchronizing data, check the background activity settings for the app. MIUI Go to Settings. → Annexes → Application management → [Title of the annex] → Battery → No restrictions.
4. Solving common connection problems
Even with the right setup, there can be failures, and let's look at the typical errors and how to fix them:
- 🔴 Device not found: Restart both devices. Make sure the clock is in pairing mode (usually a blue light flashes). VPN and the plane mode on the phone.
- 🔄 Permanent communication interruptions: Turn off the power saving mode for the watch application. Remove the watch from the list of associated devices and reconnect. Check if other Bluetooth devices (earphones, speakers) interfere with the clock).
- ⚠️ No notifications: Enable permission for the app to "Show Over Other Windows" check if the notifications are blocked by an antivirus (e.g. Avast or Kaspersky) and update the app and watch firmware to the latest version.
If the problem persists, try resetting the clock to factory settings.
- On the Mi Band: Press the touch button for 10 seconds until vibration appears.
- On Amazfit: Go to Settings → System → Reset.
- On Redmi Watch: Use the Settings menu → General → Reset.
What if the clock is connected but not synchronized?
5. Optimization of connection for stable operation
To avoid problems in the future, follow these guidelines:
- 🔋 Energy saving: Add the watch app to the battery optimization exceptions (on the MIUI This is done in the settings → Battery → Optimizing the battery).
- 📶 Distance: Keep your watch and phone at a distance of no more 8-10 Walls and interference (e.g. microwave ovens) can degrade the signal.
- 🔄 Auto Update: Enable automatic update of the watch firmware in the app settings.
- 🛡️ Security: Disable automatic connection to public Wi-Fi to avoid Bluetooth conflicts.
Xiaomi 4 Smart users with MIUI 14 have a hidden Bluetooth Priority feature that improves connection stability to activate it:
- Enter the combination ##4636## in the Phone app.
- Go to the menu "Phone Information".
- Select “Bluetooth Connection” and activate the “A2DP Priority” option.
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If the watch is quickly discharged when connecting to Xiaomi 4 Smart, turn off constant weather sync in the app settings. This will reduce the number of background requests to the phone.
6. Alternative ways of connecting (without official software)
If the proprietary application is not suitable (for example, due to regional restrictions), you can use universal programs:
- 🔗 Notify & Fitness for Mi Band – Supports advanced notifications and screen customization.
- 🔗 Tools & Mi Band – allows you to adjust vibrations, alarms and gestures without official software.
- 🔗 Gadgetbridge – works with most smartwatches, but requires manual tuning.
To connect via Gadgetbridge:
- Download APK from the official website (the app is not available in Google Play).
- Enable the developer mode on the clock (usually a 5-fold click on the firmware version in the settings).
- In Gadgetbridge, select a watch model and follow the pairing instructions.
⚠️ Note: Alternative applications may not support all of the original software’s features (e.g., measurement). SpO2 They're also more likely to cause conflicts with the voice assistants. MIUI, Therefore, make a backup copy of the data before using it.
Verification of the connection's performance
After connecting, make sure that all functions work correctly.
| Function | How to check | What to do if it doesn't work |
|---|---|---|
| Notifications | Send a test SMS or push notification (e.g. from Telegram) | Check permissions for the application in Settings → Notifications |
| Stepper | Take 10-20 steps and compare the data in the app and on the clock | Recalibrate the sensor in the clock settings (Settings → Sensors → Calibration) |
| pulsemeter | Measure your pulse and compare it to another device (such as a tonometer) | Clean the sensor on the back of the watch with an alcohol napkin |
| Managing music | Run the player on your phone and check the buttons on the clock | Enable permission to "Medical Management" for the application |
If some of the features are not available, update the watch firmware either through the app or manually (instructions for specific models can be found on the MIUI SU website).
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To work with Xiaomi 4 Smart, it is critical to disable all optimizers and add an app to power saving exceptions, which eliminates 80% of communication breakdown problems.