How to unlock Xiaomi Mi Band 4: from reset PIN-code until full recovery

Xiaomi Mi Band 4 fitness bracelet may be blocked for several reasons: incorrect input PIN-There's no unlock button on the Mi Account, there's no firmware failure after the update, there's a hardware glitch, or even an accidental activation of Find Device. Unlike smartphones, there's no unlock button on the Mi Account, all manipulations are done either through the conjugated Mi Fit app or by hardware methods. If your bracelet shows an inscription LOCKED or asks you to enter a password that you forgot, do not rush to carry it to the service: in 90% of cases, the problem can be solved independently in 5-15 minutes.

In this article, we will look at all the current ways of unlocking, from the simplest (resetting PIN through the application) to radical (full reset to factory settings with loss of data). Particular attention will be paid to the hidden features of the bracelet, which are not written in official instructions, but often rescued in critical situations. For example, few people know that Mi Band 4 can be unlocked through Bluetooth commands even without access to the smartphone with which it was paired previously.

Before you start, check:

• 🔋 Bracelet charge level (minimum 20% - otherwise it may turn off during the procedure).
• 📱 Mi Fit version (upgrade to the latest in Google Play or App Store).
• 🔄 Try restarting the bracelet (press the touch button for 10 seconds).

1 Unlocking via the Mi Fit app (if bracelet is paired)

The most obvious and safe way is to use the official app, which is suitable if the Mi Band 4 is still connected to your smartphone, but you forgot. PIN-The code or bracelet is blocked after failed attempts to enter.

Algorithm of action:

1. Open Mi Fit and go to Profile → Mi Smart Band 4.
2. Tap it on three points (⋮) in the upper right corner and select Unlock the device.
3. Confirm the action via a notification on your smartphone (you may need to enter a password from your Xiaomi account).

If the item Unlock the device is not:

• 🔄 Update the application to the latest version.
• 📱 Reconnect the bracelet: remove it from the list of devices and perform re-pairing.
• 🌐 Check the region in the Mi Fit settings (should match the region of the bracelet purchase).

⚠️ Note: If the bracelet was purchased on AliExpress or in an unofficial store, Mi Fit may not have an unlock option.

2.Dumping PIN-code without data loss (hidden function)

Little-known life hack: Xiaomi Mi Band 4 allows you to reset PIN-code without resetting completely, if you remember the date of the last sync with Mi Fit. This method only works for bracelets with firmware 1.0.9.54 and later.

Instructions:

1. On the locked bracelet, press and hold the touch button for 5 seconds until the menu appears.
2. Scroll down to Forgot PIN? (can you see Forgot Password?).
3. Enter the date of the last synchronization in DD.MM.GG format (for example, 15.05.24).
4. Confirm the action by pressing the button.

If the Forgot PIN menu does not appear:

• 🔋 Bracelet charge less than 30% – connect to charging for 10 minutes.
• 📵 Bracelet did not sync with Mi Fit for more than 7 days – the method will not work.
• 🛠️ Firmware is outdated – update the bracelet via Mi Fit (if possible).

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The sync date is stored in the Mi Fit notification history. Open the Notifications section and find the latest sync record with the bracelet.

3. Complete reset (Hard Reset)

If the previous methods didn't work, the radical method is a complete factory reset, which will remove all the data from the bracelet (steps, pulse, alarm settings), but unlock it. The procedure takes no more than 2 minutes.

Step-by-step:

1. Remove the bracelet from your hand and place it on a flat surface with the screen up.
2. Connect to the charger (required! otherwise the reset will not begin).
3. Press and hold the touch button for 15-20 seconds until the Mi logo and Reset appear on the screen.
4. Release the button – the bracelet will reboot and be ready for a new setup.

After discharge:

• 📱 Connect the bracelet to Mi Fit as a new device.
• 🔄 Update the firmware to the latest version (this will fix possible bugs that caused the failure).
• 🔒 Install a new one. PIN-code and write it down in a safe place.

⚠️ Warning: Do not interrupt the reset process, even if the bracelet vibrates for a long time or the screen is out. On average, the procedure takes 30–60 seconds. If the bracelet does not turn on after reset, connect it to charging for 1 hour.

4. Unlock via Bluetooth commands (for advanced)

This method is suitable for those who are ready to use hidden AT-commands to interact with the bracelet via Bluetooth. It requires additional software installation, but allows you to unlock the Mi Band 4 even without access to the Mi Fit.

Tools required:

• 📱 Android smartphone with Bluetooth 4.0 support+.
• 🛠️ The nRF Connect app (available on Google Play).
• 🔧 Knowledge MAC-Bracelet addresses (can be found in the Bluetooth settings of the smartphone).

Instructions:

1. Install and open nRF Connect, connect to the bracelet (the device will be called MI Band 4 or similar).
2. Go to the UART tab and send the command: AT+UNLOCK=123456 (where 123456 is the default default default password; if it doesn't work, try 000000 or 888888).
3. If the bracelet says OK, it unlocks. If it doesn't, repeat the command with a different password.

MAC-You can find the bracelet address in the Mi Fit logs if it was previously paired. Use the file manager to do this and open the folder. /Android/data/com.xiaomi.hm.health/files/log — logs will be a line with MAC: XX:XX:XX:XX:XX:XX.

5 Unlocking through firmware (if the bracelet is "brick")

In rare cases, the Mi Band 4 can turn into a so-called “brick” — a device that does not respond to buttons, does not charge or is not detected by a smartphone, most often after a failed firmware update, in which case forced flashing through special software will help.

What you need:

• 🖥️ Windows computer 7/10/11.
• 🔌 The cable for the firmware (can be made by yourself from the USB-extensioner).
• 🛠️ Programme MiBand4Tool (download from GitHub).
• 📁 Firmware file for your model (the version can be found by the inscription on the box or in Mi Fit).

Firmware process:

1. Connect the bracelet to your computer via cable (contacts should touch the bracelet charging pins).
2. Run MiBand4Tool and select the firmware file (.fw).
3. Click Start Flashing and wait until the process is over (about 5 minutes).
4. Turn off the bracelet and reset (press the button for 15 seconds).

⚠️ Warning: Wrong firmware can permanently disable the bracelet. Use only official firmware files for your model (XMSH07HM global version, XMSH08HM Chinese).

6. Contact the Xiaomi Service Center

If all of the above methods do not work, the last option is to contact an authorized Xiaomi service center.

• 💥 Hardware failure (bracelet not turned on, not charged, screen broken).
• 🔒 The bracelet is blocked after theft (purchase confirmation required).
• 🛠️ Failed firmware after which the device does not respond to reset.

How to prepare for a visit to the service:

• 📄 Take a check or confirmation of purchase (if the bracelet is warranty).
• 📱 Remove the bracelet from your Mi Fit account (if possible).
• 🔋 Charge the device to at least 50% (if it is still on).

The cost of unlocking in the service:

• 🆓 Free – if the bracelet for warranties and blocking occurred due to the fault of the firmware.
• 💰 500–1500 ₽ — If you need to flash or replace the Bluetooth module.
• 🚫 Refusal to repair – if the bracelet has autopsy marks or mechanical damage.

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Before visiting the service, check whether the warranty period has expired (usually 12 months from the date of purchase). If the bracelet was bought on AliExpress, the warranty may not be valid in Russia.

FAQ: Frequent questions about unlocking Mi Band 4