How to connect Mi Band 4 to Xiaomi phone again: full guide

Owners of the popular fitness tracker Mi Band 4 often face a situation where the device suddenly stops syncing with the native Xiaomi smartphone.This can happen after an operating system update, an account change, or simply because of a software failure of the Bluetooth module.

The problem is often not hardware breakdown, but rather the stuck pairing settings inside the Android system. The smartphone remembers the old connection and blocks the new one, considering the device is already occupied. Re-association requires the complete removal of old profiles and cleaning the cache of services, which is solved in a few minutes with the right approach.

In this tutorial, we will break down a step-by-step algorithm that will help restore the Mi Band 4 and Mi Fit (or Zepp Life) bundle to work. You will learn how to properly reset Bluetooth settings, where to look for hidden debugging menus, and what to do if the bracelet does not respond to touch. A critical step is to remove the device from the Bluetooth system settings before you try to repair in the application.

Diagnostics of conjugation problems

Before we start radical measures, we need to understand the reason for the disconnect. Often, the Mi Band 4 simply loses the connection due to the energy savings that the MIUI shell aggressively introduces. The system can force the background process of the Mi Fit application to close, believing it to be useless, which leads to data desynchronization and the inability to reconnect without manual intervention.

The second common reason is a cache overflow of Bluetooth services. When many old gadgets accumulate in the list of stored devices, new connection attempts can be ignored. It is also worth checking the version of the application itself: older versions of Mi Fit can not work correctly with new versions of Android, requiring an update or reinstallation.

Sometimes the problem is temporary, with interference in the air or a malfunction of the tracker itself, and rebooting both devices, the smartphone and the bracelet, solves the problem 30 percent of the time, and if simple methods don't work, you'll need to clean the pairing profiles more thoroughly.

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Before starting the procedure, make sure that the bracelet is charged at least 20% of the battery so that it does not turn off during the reconnection process.

Preparation of a smartphone and bracelet

To successfully re-sync, you need to prepare a software environment. First of all, make sure that your Xiaomi has all the necessary permissions for working with wearable electronics. Without access to geolocation and Bluetooth, the application simply will not see the tracker, as this is a requirement of communication protocols in Android.

Check the list of installed apps. If you have Mi Fit and Zepp Life installed at the same time, this can cause conflict. It is recommended to leave only one application, preferably Zepp Life, as it is the current successor to the Mi Fit functionality for the global market. Uninstall unnecessary programs to avoid confusion with accounts.

It's also important to turn off VPN-Services and proxy connections, if active, can change the region of the connection, while Xiaomi authorization servers are sensitive to geographic location. Make sure that the date and time on the smartphone are set automatically, as time desynchronization often blocks the process of authorization of the device.

• 📱 Check if Bluetooth and geolocation are enabled in the notification curtain.
• 🔄 Make sure that the Zepp Life or Mi Fit app is updated to the latest version.
• 🔋 Charge the Mi Band bracelet 4 minimum 20-30%.
• 🚫 Turn it off. VPN, if it is used for other purposes.

Completely clean your Bluetooth profile

The most important step is to remove the old tail from the phone's settings. Even if the bracelet appears disabled in the app, it may be listed as an active device on the system. Go to Settings → Bluetooth and find the Mi Band 4 icon or arrow next to the name and select "Disable" or "Forget the device."

Then clear the data of the intermediary application itself. Go to Settings → Apps → All apps, find Mi Fit (or Zepp Life). Select Memory and click Clear Data and Clear Cache. This will return the application to its original installation state, not deleting your accounts, but resetting the settings of the connected devices.

Also remember to clear the cache of the Bluetooth system service. In the same application menu, find "Bluetooth" (sometimes hidden, you need to turn on the display of system processes) and clear its data. This action will reset all temporary files of communication protocols that may have been corrupted.

Re-synchronization process

Now you can start the direct connection. Run the cleaned Mi Fit or Zepp Life app. If you haven't signed in before, log in. Go to the Profile tab and click Add Device. Select from the Mi Band 4 list.

At this point, the wristband should display a vibration signal and request to pair with the confirmation code. If the bracelet is silent, try tapping the touch button on it to wake the screen. Don't try to connect through the standard Bluetooth menu in Android settings - this will lead to an error, since control must go strictly through the application.

Once the code is confirmed, the bracelet will start synchronizing data and updating the firmware, which can take 2 to 10 minutes. The bracelet screen can go out and light up again, which is normal. You can't interrupt the process, keep the smartphone and tracker next to each other.

Configure access rights in MIUI

The MIUI shell is known for its strict energy saving policy, which often kills trackers' background processes. To keep the Mi Band 4 running steadily and not shutting down again, you need to set up autostart. Go to Settings → Apps → Autostart and turn on the switch opposite to your fitness app.

Then you need to lock the application in memory. Open the list of running applications (multitasking menu), find the Mi Fit window and pull it down until the lock icon appears, which will prevent the system from unloading the application from RAM when cleaning the background.

Also check notification settings. In the app menu, look for "Notifications and widgets" and make sure that notifications are allowed for all the messengers you need. Without that, the bracelet will be connected but not transmitting messages.

Table of error and decision codes

During the connection process, you may encounter various error messages. Below is a table with the most common issues and ways to fix them for Xiaomi and Mi Band 4 devices.

If you see a device-occupied error, it means that the bracelet has been previously linked to another account or phone and has not been untied correctly, in which case you need to find the previous device, remove the bracelet from its application, and only then try to reconnect.

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The main rule of stable operation is that the fitness tracker application must always have a permit to work in the background and auto-start.

Resetting the bracelet to factory settings

If the software methods on the smartphone side don't work, you'll need to reset the tracker itself. There's no physical button on the Mi Band 4, so you reset through a menu or an app. In the app, go to the bracelet profile, scroll down and select Unbind. This will trigger a reset of Bluetooth settings on the bracelet itself.

If you can't break the connection through the app, you can try resetting through the menu of the bracelet itself. Screen the screens to "More" (More), then "Settings" → "Factory Reset". Confirm the action with a touch. The bracelet will reset and be ready for a new pairing as a new device.

⚠️ Warning: Once reset to factory settings, all accumulated workout and sleep data that was not synced to the cloud will be permanently deleted.

Frequently Asked Questions (FAQ)

⚠️ Warning: Do not use third-party apps for forced connection unless you are an experienced user.They may write incorrect mac addresses to the memory of the bracelet, which will make it impossible to connect through official applications.