The Xiaomi Mi Band 4 fitness bracelet remains a popular gadget even years after its release, but sooner or later, you need to change your smartphone, transfer the device to another person or just start with a clean slate. Untie the bracelet from your phone is a procedure that at first glance seems simple, but often comes with errors: from endless download in the application to the inability to connect to a new device. In this article, we will analyze all the current ways of detachment, including hidden nuances that are not mentioned in the official instructions.
The main problem with users is that they don't understand that tying and resetting the bracelet to the factory are different procedures. One simply breaks the connection to the Mi Account or Zepp Life account, and the other completely erases all data from the device, including alarm settings, steps and sleep history, and we show how to perform both operations correctly, and also what to do if the bracelet "hangs" in the process or does not respond to commands.
It’s important to consider that Xiaomi is gradually moving Mi Band 4 users from Mi Fit to Zepp Life (formerly Amazfit) starting in 2022, which affects the interface and location of some features, so the article provides instructions for both. If you use an unofficial firmware bracelet (such as Modify or Custom Firmware), some of the ways may not work — we’ll talk about this separately.
1. Preparation for the uncoupling: what to do before the beginning
Before you break the connection between the Mi Band 4 and your smartphone, follow a few mandatory steps to avoid data loss and reconnection issues:
- 📱 Synchronize the data. Open the Mi app. Fit/Zepp Life and wait until the bracelet transmits all the accumulated data (steps, sleep, pulse) to the server. This is especially important if you plan to reset the device before the factory settings.
- 🔋 Charge the bracelet. Make sure the battery level is at least 50%. When the charge is low, the device may shut down during detachment, which will cause a failure.
- 📡 Check Bluetooth. Disconnect the bracelet from other devices (for example, if it is connected to the phone and tablet at the same time).In the Bluetooth settings of the smartphone, remove the Mi Band 4 from the list of conjugated devices.
- 🔒 Remember the firmware version. Go to the device profile. → About the bracelet in the application and write down the current version of the software. This will be useful if you need to roll back or update after the detachment.
If you transfer the bracelet to another person, warn them that after the reset, the device will require reconfiguration, including linking to a new Mi Account or Zepp Life account.
⚠️ Note: If you used Mi Band 4 to pay via Mi Pay (in countries where this feature is supported), be sure to delete the associated bank cards in the application settings before unbundling.
Method 1: Uncoupling through the Mi Fit application (official method)
This is the most reliable and recommended way Xiaomi, suitable for most users, if the bracelet is properly synchronized with the phone, the instructions are relevant for the version of Mi Fit 4.6.0 and later:
- Open the Mi Fit app and go to the Profile tab (the person icon in the lower right corner).
- Select your Mi Band 4 from the device list. If you have multiple wristbands, make sure you pick the one you want.
- Put three points on it (⋮) in the upper right corner of the device screen and select Delete Device.
- Confirm the action by clicking Delete in the window that appears. The bracelet vibrates - this is a signal that the connection is severed.
After that, the Mi Band 4 will disappear from the list of devices in the Mi Fit, but the data on the bracelet itself will remain. To completely clean it, you will need to reset (more about this in the next section).
If the Delete button is inactive or not, try:
- 🔄 Update the Mi Fit app to the latest version.
- 📱 Reboot your smartphone and bracelet (to reboot the bracelet, press and hold the touch button for 10 seconds).
- 🔗 Temporarily shut down VPN Proxies – sometimes they block communication with Xiaomi servers.
Synchronized all data | Bracelet charged over 50% |Bluetooth on and stable |Mi Fit app updated-->
Method 3: Decoupling through Zepp Life (formerly Amazfit)
Since 2021, Xiaomi has been migrating Mi Band users to Zepp Life (formerly Amazfit) and if you’ve migrated or originally used the app, the detachment process is slightly different:
- Open Zepp Life and go to the Device tab (the bracelet icon at the bottom of the screen).
- Select your Mi Band 4 and tap the gear icon (⚙️) top-right.
- Scroll down to the Device Management section and click Untie the Device.
- Confirm the action by entering a password from your Zepp Life account (if requested).
Unlike Mi Fit, Zepp Life sometimes requires additional confirmation via SMS or email. If the code doesn't arrive, check the Spam folder or try to request it again after 5 minutes.
Once uncoupled in Zepp Life, the bracelet automatically goes into a new connection waiting mode, but as with the Mi Fit, the data on the device remains — a reset is needed to clean it completely.
⚠️ Note: If you used the same Mi Fit and Zepp Life account, the uncoupling in one app doesn't always sync with the other. For example, after you delete the bracelet in Zepp Life, it can remain tied to Mi Fit. Check both apps! What if Zepp Life doesn't see Mi Band 4? If the app doesn't detect the bracelet, even though Bluetooth is enabled: 1. Remove the Mi Band 4 from the list of conjugated devices in the phone's Bluetooth settings. 2. Reboot the bracelet (hold the 10 seconds button until vibration). 3. In Zepp Life, go to Add Device → Mi Smart Band 4 and try again. If the problem persists, try using another smartphone to untie. 4. Method 3: Hard reset without phone If the bracelet does not respond to commands from the application or you lose access to the phone to which it was attached, the only way out is a complete reset to factory settings: 📊 History of activity (steps, sleep, training). ⏰ Alarm clocks and reminders. 🔒 To reset the Mi Band 4, do the following: Remove the bracelet from your hand and place it on a flat surface. Find a physical button (the touch area under the screen) on the case and hold it pressed for 15-20 seconds until the Mi logo appears on the screen. Release the button. The bracelet vibrates and resets - this is a signal that the reset was successful. After the reboot, a welcome message in Chinese/English will appear on the screen (depending on the firmware version). Now the bracelet is ready for a new binding. If the bracelet does not turn on after reset or freezes on the logo, connect it to charge for 30 minutes - sometimes this helps to restore performance. Problem Possible reason The bracelet solution does not reset (does not respond to the hold of the button) Battery discharged or mechanical failure of the button Charge the device for 1-2 hours, then try again. If it does not help - contact the service After the reset screen flashes and goes out Firmware failure or memory damage Try to flash the bracelet through Mi Fit or MiBandTools utility Bracelet requires an update after reset Outdated version of the software Connect to Mi Fit/Zepp Life and install updates Unable to link bracelet to new phone Residual binding to old account Reset again or use another Mi Account 💡If the bracelet displays Chinese characters after reset, it means that the firmware with a regional restriction. To change the language, connect it to Mi Fit and select the desired region (for example, Russia or Europe) in the device settings). 5. Uncoupling the device associated with Mi Account (if you forgot the password) One of the most difficult situations is when the Mi Band 4 You are tied to your Mi Account and you do not remember login details or have lost access to your account. email/phone. In this case, the standard detachment methods will not work, as the system will require authorization. If you have access to an old phone, check it out. SMS Reset via another account, ask a friend or relative to temporarily link the bracelet to their Mi Account, and then uncouple it: 📱 Install Mi Fit on another phone. 🔄 Reset the bracelet (mode 3 of this article). 🔗 Connect the bracelet to a new account and immediately untie it.A call for Xiaomi.If the bracelet is tied to an account you can't restore, email support via the form on the site. Attach a purchase check or a photo of a box with a serial number - this will increase the chances of unlocking. In extreme cases, you can try to flash the bracelet through unofficial utilities like MiBandTools or Notify & Fitness, but this requires technical skills and can lead to the loss of warranty. 💡If you bought the Mi Band 4 with your hands, be sure to check if it is untethered from the previous owner.A bracelet tied to someone else's account will not sync data and can block functions (such as notifications). 6. Frequent errors and how to avoid them Even when following instructions, users encounter problems. Here are the most common mistakes and ways to fix them: 🔌 If the battery level is below 20%, some functions (including resetting) may be blocked. Charge the device to at least 50%. 📵 Bluetooth is turned off during the procedure. On some smartphones (especially with the MIUI or EMUI) Power-saving mode automatically shuts down Bluetooth. Before uncoupling, turn off battery optimization for Mi Fit/Zepp Life in the phone settings. 🔄 The bracelet got stuck after reset, if the screen shows the Mi logo more 5 minutes, connect the device to the charger on 30 minutes, then repeat the reset. 📱 The app doesn't see the bracelet after the undock.Remove the Mi Band 4 from the list of conjugate devices in your phone's Bluetooth settings and reboot both devices. 4 with unofficial firmware (e.g. Modify), some features may not work properly. In this case: Install the original firmware through Mi Fit. 3). Tie the bracelet back up. 💡Before selling or transferring the bracelet to another person, not only untie it, but also update the firmware to the latest version. This will save the new owner from compatibility issues. 7. What to do after the detachment: setup from scratch After a successful detachment, the Mi Band 4 is ready for a new tether. To connect it to another phone: Install the Mi Fit or Zepp Life app on the new device. Sign in to your Mi Account or create a new one. In the app, click Add Device and select Mi Smart Band 4. Follow the instructions on the screen. The bracelet should vibrate when you connect successfully. If the bracelet is not identified, check: 📱 Smartphone compatibility (requires Android 5.0)+ or iOS 10.0+). 🔄 Bluetooth Version (to be supported by Bluetooth 4.0) LE). 📡 No interference from other devices (e.g. headphones or smartwatches) is recommended after binding: 🔋 Update the bracelet firmware through Settings → The bracelet. → Update of the PO. ⚙️ Set up notifications, alarms and activity goals. 📊 Sync your data with Google Fit or Apple Health (if you need to). FAQ: Frequently asked questions like Can you untie the Mi Band 4 without your phone? Yes, but only by a hard reset. To do this, hold the button on the bracelet for 15-20 seconds until the Mi logo appears. However, this method erases all data from the device. After untieing the bracelet does not turn on. What do you do? Connect the Mi Band 4 to charge for 1-2 hours. If the screen does not respond, try resetting it again. If the problem persists, the battery may have run out to a critical level or the power controller failed, in which case contact the service. How do you know if the bracelet is untied from the previous owner? Connect the Mi Band 4 to your phone via Mi Fit or Zepp Life. If the app requests the data of the previous account (Mi Account), the bracelet is not untied. In this case, reset (method 3) or contact the previous owner. Can you untie the bracelet through the computer? No, there are no official tools to untie the Mi Band 4 via the PC. All operations are performed through the Mi Fit or Zepp Life mobile applications. However, you can use Android emulators (e.g. BlueStacks), but that doesn't guarantee success because of Bluetooth issues. Why does the bracelet show Chinese characters after untieing? That means that the bracelet has firmware for the Chinese region. To change the language, connect it to Mi Fit, go to Settings → The bracelet. → Region and select Russia or Europe. After synchronization, the language will change to English/Russian (depending on the software version).