Connecting Xiaomi Mi Band 4 to a smartphone: a complete guide with error solutions

Introduction: Why You Need the Right Connection Algorithm

The Xiaomi Mi Band 4 fitness bracelet remains one of the most popular wearables even years after its release, thanks to a balance of price, functionality and reliability. However, many users face difficulties already at the stage of first synchronization with the phone. Connection errors, app “hang” or lack of reaction of the bracelet to actions in Mi Fitness (formerly Mi Fit) can spoil the first impression.

In this article, we will examine not only the standard procedure for pairing the Mi Band 4 with Android and iOS, but also the nuances that the manufacturer does not say: for example, why the bracelet may not be detected on the iPhone after an iOS update, how to circumvent the restrictions of regional versions of the application, and what to do if the charging indicator is on, but the device does not turn on, special attention will be paid to setting up notifications, synchronizing sleep and heart rate data, as well as hidden functions that are activated only through third-party applications like Notify & Fitness.

If you've tried to plug in the bracelet before and you've got an error like Unable to connect or Device not found, don't be in a hurry to reset the settings. 90 percent of the time, the problem is solved by adjusting your phone's settings or reinstalling the app with the right permissions, let's start with preparation.

Preparation for connection: what to check before synchronization

Before you start pairing, make sure your smartphone and bracelet meet the minimum requirements.The Mi Band 4 officially supports:

• 📱 Android 5.0 and higher with Bluetooth 4.2 support)
• 🍎 iOS 10.0 and higher (iPhone) 5s or newer)
• 🔋 Bracelet charge at least 20% (with a low charge, failures are possible)
• 📶 Stable Internet connection (to download the bracelet firmware)

Pay special attention to the regional settings of the Mi Fitness app. If your Xiaomi account is registered in China and you are in Europe, you may have problems displaying certain features (for example, contactless payments or voice assistant).

Charge the bracelet to 50% |

Install the latest version of Mi Fitness|

Enable Bluetooth and geolocation on your phone |

Make sure the bracelet is not connected to another device |

Shut down. VPN (It can block Xiaomi servers)-->

Also check if the Mi Band 4 is connected to another phone, and if the bracelet has been used before, it should be reset to factory settings.

1. On the bracelet, swipe down from the main screen.
2. Select Settings → Reset (icon with wrench).
3. Confirm the action by pressing the bracelet screen.

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If the bracelet doesn’t respond to touch, plug it into charging for 10 minutes – sometimes a discharged battery blocks the sensor.

Step-by-step: Connecting to Android

Syncing with Android is usually smoother than with iOS, thanks to the more flexible Bluetooth settings.

1. Install Mi Fitness from Google Play. Avoid third-party APKs, which may contain stripped-down functionality.
2. Sign up or sign in to your Xiaomi account. If you don’t have an account, create it through Register → By email.
3. Allow access to: 📍 Geolocation (required for device search) 📱 Contacts (for call notifications) 📁 Storage (for backup copies of data)

Activate Bluetooth

Mi Fitness

Profile → Add the device → Bracelet

Mi Smart Band 4

and

Once you've successfully connected, the app will suggest you update your firmware. Don't interrupt the upgrade process, which can lead to the bracelet becoming "bricky" when it stops turning on and requires you to flash it over the PC. The average refresh time is 5-10 minutes. If the process is delayed, check the stability of the Internet connection.

Connection to iPhone: features and circumvention of restrictions

iOS users often find that Mi Band 4 is not connected the first time or some features are not available, due to Apple's policy limiting the background of applications, to minimize problems:

1. Install Mi Fitness from the App Store. Make sure the app version is at least 5.6.0 (older versions may not support iOS 15+).
2. In your iPhone settings, go to Privacy → Geolocation Services and select the Always option for Mi Fitness.
3. In Settings → Bluetooth, find the Mi Band 4 and click on the "i" icon next to it. Activate the Connect to Network option (this will allow the bracelet to interact with the Internet via iPhone).
4. In the Mi Fitness app itself, in Profile → Bracelet settings → Notifications, enable all permissions manually.

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For maximum autonomy, turn off constant heart rate monitoring and automatic sleep detection, which will increase the life of the bracelet from 10 to 15-20 days.

If standard dials are scarce, custom dials can be installed through apps like Amazfit Watchfaces (instruction below), but note that informal dials can reset after a firmware update.

Solving common connection problems

Even with the correct following of the instructions, users face typical errors, and we will analyze the most common ways to eliminate them:

⚠️ Note: If the bracelet vibrates when connected, but the application gives a Connection failed error, the problem may be a Bluetooth connection conflict. Disable all other devices (earphones, speakers) and try again.

If after updating the firmware bracelet stopped showing the time or reset settings, follow the following steps:

1. Turn off the bracelet from your phone in Mi Fitness.
2. Reset the bracelet to factory settings (as described above).
3. Reconnect and wait for the data to be synchronized again (it can take up to 10 minutes).

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If the bracelet after the update began to discharge quickly, roll back the firmware through Mi Fitness (section Profile → Firmware Update → Return to the previous version).

Hidden functions and advanced settings

Mi Band 4 hides a few useful features that aren’t activated by default.

• 🔐 Locking the phone when the bracelet is removed (included in Mi Fitness) → Security. It only works on Android.
• 📸 Camera control – you can take pictures by gesture (shake the bracelet) or through the bracelet menu.
• 🎵 Music control – switching tracks and volume control (required to include in bracelet settings).
• 🏃 Do Not Disturb – Disables all notifications for a given amount of time (useful at meetings or during sleep).

To activate contactless payments (available only in some regions) you need to:

1. Change the region of your Xiaomi account to China (in profile settings).
2. Add a bank card to Mi Pay (Chinese phone number required for verification).
3. Link the card to the bracelet in Mi Fitness → Mi Pay.

If you lack standard dials, you can install custom ones through third-party applications:

1. Download Amazfit Watchfaces or Mi Band Master.
2. Select your favorite dial and click Install.
3. Confirm synchronization in Mi Fitness (rebooting of the bracelet may be required).

FAQ: Answers to Frequent Questions