Activating your wireless connection is the first and most important step in starting to operate your new activity tracker. Many users mistakenly believe that you need to look for a separate Bluetooth button in the device’s menu to work with the Xiaomi Band 4, but the architecture of this gadget is different. The wireless module in the fourth generation bracelet is always in standby mode and activates automatically when you first pair with the smartphone.
The main task of the owner is not just to turn on the radio module, but to properly initiate the mating process through the official application. Without this step, the transmission of pulse data, steps and notifications is impossible. It is important to understand that the control of the connection is completely delegated to the software on the phone, not to the physical buttons on the case.
In this article, we will take a detailed look at the whole way from unpacking to stable synchronization, paying special attention to the nuances of the Android and iOS operating systems. You will learn how to avoid common errors when the phone “cannot see” the device, and how to force the search to start if the automatic setting failed.
The principle of operation of the wireless module in the Mi Band 4
The Bluetooth Low Energy (BLE) technology used in Mi Band 4 is very different from the classic Bluetooth we're used to in headphones, and the main feature is the minimal power consumption: the module sleeps most of the time and wakes up only a fraction of a second to transfer a data packet or check the status of the connection, which is why you won't find an on/off switch in the interface of the bracelet.
Activation occurs when the Mi Fit (or Zepp Life) application sends a special signal to the bracelet chip. Until then, the device is in detection mode, but does not broadcast its identifier permanently to save battery power. The communication protocol requires authorization, so a simple scan by third-party programs will not give a result without prior binding.
And it's worth noting that once you've set up the bracelet, it controls the state of its transmitter, and if you move far away from the phone, the connection will break, but the module will not shut down completely, but will go into rare poll mode to instantly restore the connector when you return to range, which provides continuous health monitoring.
Why can't you turn on Bluetooth with a button?
Preparing a smartphone for pairing
Before you try to connect a fitness bracelet, you need to make sure that your smartphone is properly configured. Often the problem lies not in the gadget itself, but in the permissions of the operating system. To work correctly, the Mi Band 4 requires not only active Bluetooth, but also enabled geolocation (GPS). This requirement is due to the features of Android, where scanning is performed. BLE-devices equated to location determination.
Make sure your phone is not running Flight mode and that the Bluetooth adapter is working properly. Try connecting any other device, such as wireless headphones, to prevent hardware failure. It is also critical to download the correct app, as third-party programs may not support full functionality or the latest firmware versions.
- 📱 Install the official Zepp Life app (formerly Mi Fit) or Mi Fitness from Google Play or App Store.
- 📍 Turn on geolocation (GPS) in the phone settings and give the app permission to access the location "Always».
- 🔋 Check the charge of the bracelet - at a low charge level (less than 10%), it may not go into pairing mode.
- 🔄 Reboot your smartphone to clear the Bluetooth stack cache and start all necessary system services.
For stable operation of the BLE 5.0 protocol, which is used in this model, it is desirable to have Android 6.0 or iOS 10.0 and higher. On older versions of the OS, the process of finding a device can take much longer or end in error.
Step-by-step instructions for connecting via Mi Fit (Zepp Life)
The initial activation process for a Bluetooth connection is standardized and takes no more than two minutes. Open the installed application and log in to your account. On the home screen in the lower right corner, find the Profile tab (or human icon). Here, in the Devices section, click the Add Device button.
In the list of available gadgets, select Band, and then specifically the model Mi Smart Band 4. the application will go into active search. At this point, a vibration or an image of a smartphone may appear on the billing screen, which signals readiness for pairing. Press the confirmation button on the tracker screen (usually a long press on the touch area), if such action is required.
Once you've successfully detected it, you'll see a pairing request on your smartphone screen, and the codes on the devices may not match visually, but the system will check them automatically. Click "Confirm" or "OK." The connection setup process will take a few seconds, and then time and data synchronization will occur.
☑️ Checklist of successful connection
If it goes well, you'll see the connection animation, and then the main screen with the steps. From now on, the Bluetooth channel is considered active. The application will automatically request a firmware update if a new version is available, which is highly recommended to improve the stability of the connection.
Bluetooth settings in the Mi Fitness app
For owners of new Xiaomi and Redmi smartphones, Mi Fitness (formerly Xiaomi Wear) is often pre-installed. The logic is similar, but the interface is different. Launch the app and log in through your Mi Account. Go to the Devices tab and click Add Device.
The system will suggest scanning. QR-code that is on the back of the bracelet or in the instructions. If the code is not readable, select the device from the list manually. Unlike Zepp Life, here the process may require confirmation through the system pop-up window. Android/iOS, where you need to press "Connection." Don't ignore this window, or the connection will be interrupted.
⚠️ Note: When using the Mi Fitness app on Android 12 and up, the system may request permission to search for devices nearby, a requirement for a Bluetooth scanner to work. Without this permission, the app will not be able to physically see your bracelet.
Once you're tied, the app will open up the advanced settings, and you can configure the notifications that will come to your wrist and the health monitoring settings.
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Tip: If the bracelet was previously connected to another phone, be sure to remove it from the Bluetooth settings of the old device.The Mi Band 4 can't broadcast a signal to two smartphones at the same time, and trying to connect to a third device without breaking the old connection often leads to errors.
Problem Solving: The phone can't see the bracelet
It's quite common for a smartphone to stubbornly fail to detect the Mi Band 4, and most often it's because the bracelet has got stuck in standby mode or lost its pairing profile, so you need to reset the Bluetooth settings on the tracker itself, and then go to the bracelet menu (swipe left to stop), find System or More, and select Unbind.
Once the connection is broken, the bracelet will return to factory standby mode and can be found again through an in-app search. If that doesn't help, try "forgetting" the device in the phone's Bluetooth settings. Go to Settings → Bluetooth, find the Mi Band 4 list, click on the gear icon, and select "Forget the device" or "Cance pairing."
Sometimes it helps to restart the phone’s Bluetooth stack completely: turn on and off “flight mode”, then activate Bluetooth again. Also check if the bracelet is connected to background applications such as Notify for Mi Band. Third-party programs can intercept control of the module, blocking access for an official client.
| Problem. | Possible cause | Decision |
|---|---|---|
| No bracelet found. | GPS is turned off or no access rights are available | Enable geolocation and grant permission to the application |
| The pairing error | Profile conflict | Remove the device from the phone’s Bluetooth settings |
| Persistent breaks | Energy conservation | Turn off energy savings for the Mi Fit app |
| No notifications coming. | No rights to notice | Allow notifications to be accessed in phone settings |
In rare cases, the problem may be hardware: If the bracelet does not respond to charging and the screen does not turn on when connecting to the charger, the battery may be drained or the power controller may have failed, in which case the software methods for turning on Bluetooth will not work.
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The main cause of connectivity problems in 90% of cases is a conflict of pairing profiles. Completely removing the device from the phone’s memory and re-associating from scratch solves most technical difficulties.
Optimization of work and energy saving
Once activated successfully, it is important to set up the system so that the connection is stable but does not waste battery power. Modern versions of Android aggressively “kill” background processes, which can lead to a break in connection with the fitness tracker. To avoid this, find the Mi Fit (or Zepp Life) application in the list of installed programs and in the “Battery” section, select the “No Limits” mode.
It’s also worth checking the Bluetooth settings. Some shells (MIUI, EMUI) have a “Bluetooth” feature in the Battery section, where you can prevent the system from turning off the module to save power. Although the BLE protocol is extremely economical, system restrictions can interrupt its operation when you lock the phone screen.
For iOS users, the situation is simpler, but there are nuances here too: If you notice that steps don’t sync automatically, try opening the app manually. iOS strictly controls background activity, and sometimes requires manual “waking” of the app to transfer accumulated data from the bracelet.
⚠️ Warning: Don't use your phone's "memory cleaners" and "accelerators" too often. These apps can force the Mi Fit process to close, causing the bracelet to lose connection and stop transmitting real-time pulse data).