Connecting Xiaomi Mi Band 4 to Samsung phone: full instruction with error solutions

Although the Xiaomi Mi Band 4 was released in 2019, it is still one of the most popular fitness bracelets due to its combination of price, functionality and compatibility. However, Samsung phone owners often face problems when trying to connect a device, from Bluetooth errors to malfunctioning of the official Mi Fit app. In this article, we will discuss all possible ways of synchronization, including bypassing typical bugs and using alternative applications.

Many users mistakenly believe that the Mi Band 4 is incompatible with Samsung due to ecosystem differences (MIUI vs One UI). The problem is actually Bluetooth Low Energy (BLE) protocols and manufacturer restrictions. For example, some Galaxy S22 or A53 models may require manually enabling device scanning permission in the developer settings. We will detail how to do this, and we will also look at 3 ways to connect, from standard to bypassing through third-party utilities.

If you've already tried to sync the bracelet and you've got a "Disconnected" or "Mi Band not detected" error, don't be quick to blame the technique. 90% of the time, the problem is solved by clearing the Bluetooth cache, changing the region in your phone settings, or reinstalling the app, and we've put together a diagnostic checklist and step-by-step instructions for each scenario.

1.Preparing Samsung phone before connecting

Before you start syncing, make sure your Samsung meets the minimum requirements.The Mi Band 4 bracelet officially supports Android 5.0 and higher, but Android 10 or later is recommended for stable operation. On devices with One UI 4.0+ (such as the Galaxy S21, Note 20), conflicts can arise due to energy-saving features that aggressively close the background Mi Fit processes.

Here's what you need to do in advance:

• 📱 Update your phone to the latest version (check in Settings) → Update of the PO).
• 🔄 Reboot your phone – it will reset temporary Bluetooth errors.
• 📡 Turn on flight mode for 30 seconds, then turn off - this will reset the wireless module.
• 🛠️ If you have a Galaxy. S10 or older, activate the settings → System system → Developer parameters → Debugging by Bluetooth (how to turn on the developer – see below).

Important! Some Samsung models (such as the A71 or M31) have their devices scanned in the background by default.

1. Go to Settings → Applications → Mi Fit → Permissions.
2. Activate Allow Location Access (Yes, it affects Bluetooth!).
3. Enable Auto Start and Work in the background.

2. Installation and configuration of the Mi Fit application

The official Mi Fit app is the only legitimate way to connect the Mi Band 4 to Samsung. However, even here there are pitfalls. For example, in some regions (e.g. Europe), the app can block the connection due to GDPR restrictions. The solution is to change the region of the phone to India or China (instruction below).

Step-by-step installation:

1. Download Mi Fit from Google Play (avoid APK from third-party sources!).
2. Launch the app and sign up via Xiaomi Account, Google or Facebook.
3. Click Profile → Add Device → Bracelet → Mi Smart Band 4.
4. Allow all requests (Bluetooth, notifications, location).

Critical error: if the bracelet is not available after choosing a model, check if the phone is power-saving mode for Mi Fit. On Samsung, this is done in Settings → Device Care → Battery → Restrictions for background applications.

Remove old version of Mi Fit (if any)| Clear Bluetooth cache in phone settings|Deactivate VPN/proxy (interferes with geolocation)|Reboot bracelet (press 10 seconds button)|Make sure bracelet is >30% charge-->

3. Step-by-step connection of Mi Band 4 to Samsung

Now, to the synchronization process itself, follow the instructions precisely to avoid errors:

Step 1: Activate Bluetooth on your phone and make sure the bracelet is not connected to another device (if you have previously paired it, reset it via Bracelet Settings → Untie the device).

Step 2. In the Mi Fit app, click Add Device and select Mi Smart Band 4. The bracelet should vibrate - this is the connection signal.

Step 3: A 6-digit code will appear on your phone screen. Compare it to the code on your wristband display. If the codes match, confirm the connection on both devices.

Step 4. Wait until the synchronization is complete (it can take up to 2 minutes) and then set the basic parameters:

• ⏰ Time zone (must coincide with the phone).
• 🔔 Notifications (allow access to the SMS and call).
• 🏃 Fitness goals (steps, calories, sleep).

Mi Band 4|Mi Band 5|Mi Band 6|Mi Band 7|Other-->

4. Solving common connection errors

If the bracelet is not connected, use this table for diagnosis:

⚠️ If you are using a Samsung Galaxy with an Exynos processor (e.g., a Samsung Galaxy, S20 Exynos, you may need to disable the Adaptive Battery function in Settings → Caring for the device → Battery → This feature aggressively closes the background processes, which prevents stable connection.

Another common problem is that the bracelet plugs in, but it doesn't sync the data.

1. Open Mi Fit and go to Profile → Mi Smart Band 4 → Sync data.
2. If it doesn’t work, remove the bracelet from the app and plug it back in.
3. Check if Samsung Knox is blocking contact/notification access (Settings → Biometrics & Security → Other security options).

5. Alternative ways of connecting (if Mi Fit does not work)

If the official app stubbornly refuses to cooperate, you can use third-party utilities, the main advantage of this method is the circumvention of regional restrictions and more flexible settings, and the disadvantage is possible problems with the firmware updates of the bracelet.

Method 1: Notify & Fitness for Mi Band

Method 2: Mi Band Master (for advanced users)

This app allows you to unlock hidden Mi Band 4 features, such as:

⚠️ Attention! Using unofficial applications may result in a loss of warranty on the bracelet.In addition, some features (such as firmware updates) may not work properly.

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If you use Notify & Fitness, enable the option “Ignore battery optimization” in your app settings to prevent a connection break on Samsung with aggressive energy saving.

6. Update to the firmware of Mi Band 4 via Samsung

Once successfully connected, it is recommended to update the bracelet firmware to the latest version, which will fix bugs and add new features (for example, support for additional dials), but this process can freeze on Samsung due to background activity limitations.

How to update firmware:

1. Open Mi Fit and go to Profile → Mi Smart Band 4 → Firmware Update.
2. Make sure the bracelet is at least 50% charged.
3. Connect your phone to stable Wi-Fi (update via mobile internet may be interrupted).
4. If the update is suspended, wait 10 minutes, then restart the bracelet.

⚠️ On some Samsung models (e.g. Galaxy) A52) Updating the bracelet firmware may cause the processor to overheat. If the phone gets hot, postpone the procedure until cooling.

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If the firmware update is constantly crashing, try using a different phone (not Samsung) or connect to Mi Band 4 via Notify & Fitness – there’s sometimes firmware put more stable.

7. Optimize the Mi Band 4 with Samsung

To ensure that the bracelet works without failure, follow these tips:

• 🔋 Turn off the Adaptive Battery for Mi Fit in Samsung Settings.
• 📶 If notifications come with a delay, turn on Permanent Bluetooth scanning in Settings → Connections → Bluetooth → Additionally.
• 🛡️ Clean the Mi Fit cache regularly (in Settings) → Annexes → Mi Fit → Memory. → Clear the cache).
• 🔄 Reload the bracelet once a month (press the button for 10 seconds).

If you use Samsung Health in parallel with Mi Fit, there may be a data conflict to avoid duplication of steps:

1. Open Samsung Health and go to Settings → Connected Services.
2. Turn off sync with Mi Fit (if it was enabled).
3. In Mi Fit, disable data export to Google Fit if you are not using it.

8. Frequently Asked Questions (FAQ)