Why Xiaomi fitness bracelet is disconnecting from your phone and how to fix it

Xiaomi fitness bracelets (Mi Band, Smart Band, Band Pro series) have long been the standard for tracking activity, but even proven devices have crashes. One of the most common problems is spontaneous disconnection from a smartphone when the bracelet stops syncing data, does not vibrate at notifications or disappears from the list of connected devices, the reasons can be due to software errors and hardware limitations.

In this article, we will discuss 10 key reasons for the loss of communication between the Xiaomi bracelet and the phone, from the banal (discharged battery) to the specific (firmware conflict). For each problem, we will give you step-by-step solutions, including Bluetooth configuration, device reset, software updates and even “surgical” methods like cleaning the cache of the Mi Fitness or Zepp Life application. We will separately focus on the nuances for different models, from Mi Band 3 to Smart Band 8 Pro.

If your bracelet plugs in and out, syncs freeze at 0%, or your phone just doesn't see the device, you'll find the answer here, and for those of you who've tried everything, we've put together a list of alternative methods, including manual firmware installation and hardware malfunction diagnosis.

1. discharged battery of bracelet or telephone

The most obvious but often overlooked reason is low battery power: Xiaomi bracelets at a charge level below 10% automatically turn off the Bluetooth module to save energy, while the screen can display a battery icon, but without an exact percentage - many users simply do not notice the critical level.

Even worse, if the phone is power-saving (such as Ultra Battery Saver on Xiaomi/Redmi), the system can force Bluetooth back-up activity to break the connection to the wristband, and other brands such as Samsung, Huawei or iPhone can also be affected.

• 🔋 Check the charge level of the bracelet: click on the touch button (or swipe up on the Smart Band). 7/8) If the light is red, immediately connect to the battery.
• 📱 Turn off the power saving mode on the phone: go to Settings → Battery. → Power saving mode and deactivate it.
• ⚡ For iPhone: Go to Settings → Battery. → Battery status and check if the “Performance Limit” option is enabled».

⚠️ Note: On the Mi Band 6 and older, when charged below 5%, the bracelet may not turn on the screen when you put your hand up – check the charge via forced pressing of the button.

Bluetooth problems: conflicts, outdated versions, interference

Bluetooth is the most vulnerable link in the fitness bracelet, and problems can occur at three levels:

1. Hardware jamming: Other devices (earphones, speakers, smartwatches) operate at the same 2.4 GHz frequency and cause interference.
2. Software glitches: An outdated version of the Bluetooth stack on your phone or bracelet.
3. Connection conflicts: The phone tries to connect to multiple devices at the same time, and the bracelet falls out of priority.

To diagnose the problem:

• 🔍 Open the Settings. → Connected devices → Bluetooth on your phone and check if there is an exclamation mark next to the bracelet name (means a connection error).
• 📵 Disable all unnecessary Bluetooth devices (such as AirPods or other devices) JBL-column) and restart the phone.
• 🔄 On the bracelet, perform a soft reset: press the touch button for 10 seconds (before vibration). For the Smart Band 8 Pro, use the button combination + swipe down.

⚠️ Attention: On Android 12+ iOS 16+ Enable permission for the Mi application Fitness/Zepp Life on using Bluetooth in the background: Settings → Annexes → Permits → Bluetooth.

💡

If the bracelet is connected but the data is not synchronized, try manually running sync in the Mi Fitness app: open the device profile → click on the cloud icon in the upper right corner.

3.Mi Fitness or Zepp Life app crashes

The official Mi Fitness (for older models) and Zepp Life (for newer ones) apps are often a source of problems.

• The bracelet is connected, but the data (steps, pulse, sleep) is not updated.
• The application “hangs” on the sync screen (0% or 100%).
• After updating the application, the bracelet ceases to be defined.

Decisions:

Clear the app's cache|Update the application to the latest version|Reinstall the application|Shut down. VPN/proxy|Permit verification (geolocation, notifications)-->

To clean the cache on Android:

1. Go to Settings. → Annexes → Mi Fitness/Zepp Life → Memory.
2. Click on Clear Cache and Clear Data (Warning: This will remove local settings!).
3. Reboot your phone and reconnect the bracelet.

For the iPhone:

• Delete the app.
• Reboot the phone.
• Install the app again from the App Store.

⚠️ Warning: If the bracelet doesn’t connect after cleaning the data, try resetting it to factory settings via the menu on the device (usually Settings). → Reset).

4.Outdated firmware of bracelet or telephone

The bracelet firmware and Android/iOS version on the phone must be compatible, for example, the Smart Band 8 Pro requires Android 8.0+ or iOS 12+, and for Bluetooth 5.3 to work correctly, the phone must have firmware no older than 2022.

Critical information: Xiaomi bracelets on firmware older than 2021 may conflict with Android 13+ phones due to changes in the permission policy for Bluetooth devices, in which case only a manual update of the bracelet firmware will help.

How to check and update the firmware:

1. Open the Mi Fitness/Zepp Life app.
2. Go to the profile of the bracelet → Device settings → Update firmware.
3. If the upgrade is available, plug the bracelet into charging (charge must be >50%) and wait until it is completed.

5. Conflicts with other applications or services

Some applications can block the work of the fitness bracelet:

• 🛡️ Antiviruses (e.g. Avast, Kaspersky) – may regard synchronization as “suspicious activity».
• 🔒 VPN/Proxies – prevent connection to Xiaomi servers for data synchronization.
• 🎵 Music apps (e.g. Spotify, YouTube Music) – occupy a Bluetooth channel for streaming.
• 📱 Cloning apps (e.g. Parallel Space) – create conflicts with the original Mi Fitness.

How to diagnose:

1. Close all background applications through Recent Tasks.
2. Temporarily disable the antivirus and VPN.
3. Check if Do Not Disturb or Energy Saving is enabled for the Mi Fitness app.

💡

If the problem disappears after a particular application is closed, add Mi Fitness/Zepp Life to the antivirus or VPN exceptions.

Hardware malfunctions: from Bluetooth module breakdown to physical damage

If the software methods did not help, the reason may be a hardware breakdown:

• 📡 A Bluetooth module in a bracelet or phone is damaged (for example, after falling or getting moisture).
• 🔌 Oxidation of contacts on the charging port of the bracelet - interferes with normal operation.
• 🔋 Battery bloating – can press on Bluetooth antenna.
• 📶 Metal strap interference (e.g. on Mi Band 6 with metal bracelet).

How to check:

1. Connect the bracelet to another phone, and if there's a problem, it's a malfunction in the bracelet.
2. Try connecting another Bluetooth device (earphones, speakers) to your phone, and if it doesn't work, it's the phone.
3. Examine the bracelet for physical damage: cracks, bloating, corrosion on the contacts.

⚠️ Warning: If the bracelet falls into the water (even if it has 5 protections) ATM), The Bluetooth module could have oxidized, and in that case, only repairs or replacements would help.

💡

To check the Bluetooth module of the phone, use a test application, such as Bluetooth Scanner (Android) or LightBlue (iOS).

Manual reconnection: resetting, flashing, alternative methods

If the standard methods don’t work, try the advanced solutions:

Resetting the bracelet to factory settings

For most models:

1. On the bracelet, go to Settings → Reset (or Settings → Device → Reset).
2. Confirm the action (usually hold the button for 5-10 seconds).
3. After restarting, connect the bracelet again through the application.

Flashing through PC (for experienced users)

If the bracelet is “buried” after a failed update, you can restore it through Mi Band Tools or Notify & Fitness:

1. Download the firmware for your model from the AmazfitWatchFaces website.
2. Install the Mi Band Tools program on your PC and connect the bracelet via Bluetooth.
3. Upload the firmware to the program and follow the instructions.

For Smart Band 7/8 Pro, you may need to unlock the bootloader via ADB:

adb shell am start -n com.xiaomi.hm.health/com.xiaomi.hm.health.upgrade.UpgradeActivity

Use of third-party applications

If the official app doesn’t work, try:

• Notify & Fitness for Mi Band (Android) – supports custom firmware.
• Tools & Mi Band – Tools & Mi Band – Manually configure notifications.
• Mi Bandage – to restore communication with the iPhone.

FAQ: Frequent questions about communications losses