You try to sync your Xiaomi Mi Band, Xiaomi Watch or other smartwatch model with your phone, but the Bluetooth connection is stubbornly not installed? The problem is familiar to many owners of Xiaomi gadgets – the devices do not find each other, then the connection is interrupted after a few seconds, then there is a “failed to connect” error. In this article, we will analyze all possible causes – from banal (discharged battery) to technical (firmware failure), and also give step-by-step instructions for each watch model.
It's important to understand that the connection algorithm can vary depending on the Mi Fit/Zepp Life version, the watch model (Mi Band 7, Watch S3, Smart Band 8 Pro) and even the smartphone operating system. We've collected unique data on firmware and application versions compatibility that are rarely mentioned in standard instructions. If you've tried all the "classic" methods, here you will find solutions that work even in the most neglected cases.
1. Checking the basic connection conditions
Before digging deep into the settings, make sure the minimum requirements for successful pairing are met. Often the problem lies in the little things that users don't pay attention to.
First, check the charge level of both devices. 15%, Many models (Mi Band) 6, Watch 2 Pro) automatically disable Bluetooth Low Energy module (BLE) So the same goes for a smartphone, with a charge level that's less than that. 10% Android/iOS may limit background processes, including device search.
- 🔋 Charge clock: connect to charge for 10-15 minutes, even if the indicator shows the rest.
- 📱 Phone Charge: If the level is below 20%, turn on power saving mode without Bluetooth restrictions.
- 📶 Distance between devices: maximum distance for stable connection is 10 meters (no obstacles). Walls, furniture or other electronic devices (microwaves, routers) can cause interference.
Secondly, make sure your phone is Bluetooth enabled and it's in detection mode. On Android, check this in Settings → Connected Devices → Bluetooth Settings. On iPhone, the path is: Settings → Bluetooth. Also turn off In-Air mode, it blocks all wireless connections.
📊 What is your Xiaomi watch model?
Mi Band 7/8
Xiaomi Watch S2/S3
Smart Band 8 Pro
Another model
2. Conflict with other Bluetooth devices
One of the most common reasons why Xiaomi watches don’t connect is because they are in conflict with other gadgets that already pair with a phone, because many budget smartphones (especially those on MediaTek) have a limit on how many devices are connected at the same time. BLE-If you already have headphones, a fitness bracelet or a speaker on your list of connected devices (usually no more than 3-5), the system can block the new connection.
The solution is simple: remove all unnecessary devices from the list of conjugated devices.
- Open Settings → Connected devices → Previous connections.
- Find devices you’re not using right now (like old headphones) and click “Forget.”
- Reboot your phone and try to reconnect the watch.
On the iPhone, the path is different: Settings → Bluetooth, then click on the icon “i” next to the device and select “Forget this device”.
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If you have a Xiaomi Watch S3 or newer, try connecting in single-touch mode: press the button on the watch before vibration, then touch the phone screen against the dial. This will work even if standard pairing fails.
Another nuance is the Bluetooth profile conflict: some Xiaomi watches (such as the Mi Band 5) require an A2DP profile to transmit sound, but if it is occupied by another device (such as a speaker), the connection can break down, in which case only a complete network reset on the phone will help:
On Android: Settings → System → Reset → Resetting Wi-Fi, mobile network and Bluetooth
On iPhone: Settings → Mainstream → Removing or resetting iPhone → Reset → Reset the network settings
3.Problems with Mi Fit/Zepp Life app
The official Mi Fit and Zepp Life apps (for newer models) are often the source of connectivity problems, and here are the most common scenarios:
- 📱 Older version of the app: If you haven’t updated Mi Fit in a while, it may not support the new Bluetooth protocols used in the watch.
- 🔄 Cache and data: accumulated temporary files can block pairing.
- 🚫 Restrictions of the OS: Android 12+ iOS 15+ introduced additional permissions for working with Bluetooth in the background.
The first thing you need to do is update the app to the latest version: for Mi Fit, the current version at the time of 2026 is 4.6.0+, for Zepp Life, 5.12.0+. Check this out on Google Play or the App Store.
If the update didn’t help, do a full cleaning of the cache and app data:
Close the application through the latest task menu
Open the Settings. → Annexes → Mi Fit/Zepp Life → Warehouse
Click "Clear Cache" and "Clear Data"
Reboot the phone.
Run the app again and try to connect.-->
For owners of Xiaomi smartphones there is an additional life hack: use the “Developers” mode to reset Bluetooth settings:
- Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
- Back to Settings → Additionally. → For developers.
- Find the item “Reset Bluetooth settings” and confirm the action.
What if the clock is not connected after data clearing?
If the Mi Fit clock is no longer defined after the data reset, try forced synchronization: 1. Hold the button on the clock 10 seconds until double vibration (reset). 2. In the app, click "Add device" and select the model manually (even if it is not automatically determined). 3. When you request pairing on the phone, do not confirm immediately - wait 20-30 seconds, then press "Connect." This method works in 70% of cases for the Mi Band 7 and S2 after reset. 4. Resetting the clock, this procedure solves all the problems with the Bluetooth device, but the complete setup time has been removed from the factory. Reset method depends on model: Watch model Reset method Mi Band notes 3/4/5/6/7/8 Hold the touch button. 10–15 seconds before the Mi logo appears.Once reset, the watch automatically resets. - Xiaomi Watch S1/S2/S3 Press the physical button 10 seconds → select "Reset" on the screen. You need confirmation by pressing a button. 8 Pro Go to Settings → System system → Reset on the watch screen.It is recommended to untie the watch in the app before reset.Mi Watch Revolve Hold both buttons at the same time 5 After reset, the watch will request a reset. After reset, do not immediately connect the watch to the phone. Follow the following steps: Wait for the watch to fully load (the screen will show time). Fit/Zepp Life, remove the device from the list (if it's still there), restart the phone. Only then start pairing again. 5. If Xiaomi watches stopped connecting after updating the firmware (or, conversely, you have an outdated version), the problem may lie in the incompatibility of Bluetooth protocols. 7 firmware 1.10.5.0 It will not work smoothly with Android. 13 stack-change BLE. Check the firmware version of the watch: On Mi Band: Profile → About the clock → Firmware version. On Xiaomi Watch: Settings → System system → About the program. Current versions of firmware on 2026 The last version of the Minimum version of the Mi Fit/Zepp Life Mi Band 8 1.12.8.1 4.6.0 Xiaomi Watch S3 2.21.5.3 5.12.0 Smart Band 8 Pro 1.5.67 5.10.0 If your firmware is outdated, update it through the application: Open Mi Fit/Zepp Life and go to the watch profile. Find the "Firmware Update" item (could be called "Check for updates"). Connect the watch to charging (update requires). 50%+ charge). Wait until the process is complete (don't interrupt the connection!) If the firmware is relevant but the problem remains, try rolling back to the previous version. To do this, Remove the watch from the app. Reset it to factory settings. Manually download the old firmware (for example, for Mi Band 7 you can find 1.9.6.0 on the forums). XDA Use the Mi Band Tool or Notify & Fitness utility for manual firmware. ⚠️ Warning: Manual firmware updates can result in loss of warranty and irreversible damage to the watch if the wrong version is selected. Use this method only if you are confident in your actions. S3 It is not recommended to roll back below 2.20.0 - this can block the module. NFC. 6.Conflict with the phone operating system Sometimes the problem lies not in the watch, but in the smartphone. This is especially true for devices on MIUI, ColorOS or EMUI, where manufacturers are actively optimizing background processes, which leads to a break in Bluetooth connections. POCO on MIUI 13/14, Follow the following steps: Open Settings → Annexes → Application management → Mi Fit/Zepp Life. Select Battery and set No Limits. Turn on Auto Start and Background Activity. → Connected devices → Bluetooth disable "Battery Savings for Bluetooth". For owners of Samsung (One) UI) Huawei (EMUI) Disabling Aggressive Optimization Can Help: On Samsung: Settings → Caring for the device → Battery → Settings → Sleeping apps → Remove Mi Fit from the list on Huawei: Settings → Battery → Launching applications → Mi Fit → Install Manually Managed If you use custom firmware (e.g. LineageOS, Pixel Experience), the problem may be incorrect operation of the Bluetooth stack. BLE 5.0+ (Required for the Mi Band 7+ Install an alternative Bluetooth stack, such as the Bluetooth Library Patcher (root rights required). Try connecting via another app, such as Notify & Fitness or Tools & Mi Band. ⚠️ Note: On phones with Qualcomm Snapdragon 8 Gen 1/2 (for example, Xiaomi 12/13, Redmi K50) There's a famous cliff bug. BLE-post-compound 5–10 The solution is to disable the Adaptive Battery in the developer settings or update the firmware to MIUI 14.0.5+. 7. Hardware malfunctions If none of the software methods worked, it may be a hardware problem: 🔌 Bluetooth module in hours (especially after falls or moisture inhalation). 📶 Bluetooth antenna in the phone (relevant for smartphones after repair). 🔋 Charging contacts – if the watch is not charging properly, it can affect the operation of the module. To check if the watch is to blame, you can try to connect the watch to another phone (preferably on another OS – if it did not work with Android, check on the iPhone, and vice versa). If the connection is successful, there's a problem with your smartphone. If it's not, there's a malfunctioning watch. Symptoms Probable cause Clocks are not determined by any device Bluetooth module Failure Module Replacement module (only in the service center) Connection interrupted when moving hand Damage antenna or plume Diagnostics in the service Clocks are connected, but do not synchronize data Reset and repair Bluetooth is enabled only after restart Power failure module Repair or replacement board If Xiaomi watch warranties, contact the official service center. For models older than 2 years, repairs can be more expensive than buying a new watch, in which case consider alternatives: Buying a Bluetooth adapter (e.g., Avantek) BTA-100) connect through. Use of alternative applications such as Gadgetbridge (requires root or ADB-Transition to wired synchronization (if the model supports, for example, Xiaomi Watch) S3 through USB-C). 8. Alternative ways to connect If the standard Bluetooth connection has not worked, try workarounds: 1: Some apps, such as Notify & Fitness or Tools & Mi Band, use alternative protocols to communicate with Xiaomi watches.They can work even if the official app refuses to connect.Instructions: Remove Mi Fit/Zepp Life from your phone. Install Notify & Fitness from Google Play. Enable Developer Mode on your watch (for Mi Band) 7+: Settings → About the clock → Press. 5 Once on "Firmware Version"). In the app, select "Connect new device" and follow the instructions. Method 2: Connection through ADB (For advanced users, if you have experience with ADB, You can try to force the clock to connect through the command line. 5/6/7 Xiaomi Watch S2: adb shell am start -n com.xiaomi.hm.health/com.xiaomi.hm.health.device.AddDeviceActivity adb shell settings put global bluetooth_on 1 adb shell am broadcast -a android.bluetooth.adapter.action.REQUEST_DISCOVERABLE -e android.bluetooth.adapter.extra.DISCOVERABLE_TIMEOUT 120 Method 3: If you have a second smartphone (even an older one), you can use it to synchronize data with the clock and then transfer it to the main device via the cloud or manually. Export data to Google Fit or Apple Health. Import data from these services on your main phone. 💡For the Xiaomi Watch S3 Smart Band 8 Pro has an undocumented Wi-Fi Direct connection function. To activate it, hold the button on the clock. 5 So for a second, then select "Wi-Fi Sync" from the menu, which works even if you have a faulty Bluetooth module, but requires you to connect to the same Wi-Fi network on both devices. FAQ: Frequent questions about Bluetooth connectivity to Xiaomi watches ❓ Why Xiaomi watches connect to the phone but immediately switch off? 6/7 Xiaomi Watch S2 When connecting to Android phones 12+ iOS 16+. The reason is aggressive power optimization, which kills the background processes of Mi Fit. Solutions: Add Mi Fit to the list of "Optimization Exceptions" (on Android). Turn off "Background Limitation" for the application (iOS). Install the old version of Mi Fit (4.5.0 Android, 4.4.6 iOS). If nothing helps, try connecting via Notify & Fitness – this app bypasses OS restrictions. ❓ Can you connect a Xiaomi watch to a computer or tablet? Technically, but with reservations: Windows/macOS: The watch will be defined as a device, but data synchronization is possible only through specialized software like Gadgetbridge (needs Bluetooth). 4.0+). Android Tablets: Connection is possible, but Mi Fit may not support tablet versions of the OS. Use Notify & Fitness. iPad: Xiaomi Watches are not officially supported, but you can try through Tools & Mi Band (without stability guarantee). S3 There is an unofficial way to connect to the PC through ADB It requires technical skills, but it requires technical skills. ❓ What to do if Xiaomi watches are connected but do not sync data? This problem is usually related to: Time conflict: Check to have the same time on the watch and phone (turn on "Time Autosynchronization" in the watch settings). Memory overflow: On the Mi Band 7 older than 1000+ Records in step history, synchronization is slowed down. Reset the data in the app. Background lock: On Android, open Settings → Annexes → Mi Fit → Battery and disable all restrictions. If the data is not synchronized only for a specific parameter (for example, pulse), try: - Disable and turn this parameter back on in the watch settings. - Delete and re-add the widget to Mi Fit. - Reset the clock to factory settings. ❓ Why Xiaomi Watches Don't Connect to iPhones? iPhone Connection Issues (especially on iOS) 15/16) Apple restrictions: iOS blocks Bluetooth background work for uncertified devices. Xiaomi doesn't always have time to get certificates for new models. Conflict with AirTag: If you have AirTag, it can take up the BLE slot needed for the watch. Obsolete firmware: iPhone requires firmware no lower: Mi Band 7: 1.7.0.14+ Xiaomi Watch S2: 2.19.0.1+ Solutions: Update the watch firmware through an Android device (if possible). Disable Intermittent Bluetooth Scanning in Settings → Privacy → Geolocation Services → System Services → Fitify & Notify.