How to restart the switched off Xiaomi Mi Band 4: all the ways if the bracelet does not turn on

Why Mi Band 4 may not turn on and when you need a reboot

The Xiaomi Mi Band 4 fitness bracelet is a reliable device, but even it sometimes refuses to turn on after a discharge, firmware failure or mechanical impact. If the screen remains black and charging does not help, the problem can lie in the system freeze, a dead battery or damage to contacts. In 80% of cases, forced reboot helps - a procedure that resets temporary errors without losing data.

But not all reboots are equally effective. For example, if the bracelet is zero, a simple button press won't work, you'll need to connect to a key-holder charger, and in cases of software failure, you might need to reset via the Mi Fit app or even firmware through the Mi Band Tool. Next, we'll look at all the methods, from simple to radical.

Before you start rebooting, check:

• 🔋 Charger: Try another one USB-port or cable (sometimes a problem with the power supply).
• 🔌 Bracelet contacts: clean them of dust/moisture with a cotton swab soaked in alcohol.
• 📱 Mi Fit: Update to the latest version in Google Play or App Store.

Method 1: Classic button reboot (if the bracelet responds to charging)

If the Mi Band 4 has any response to the charger connection (lights up, vibrates), try a standard reset. This method works even if the screen is not turned on, but the device is determined by the computer or phone as connected.

Instructions:

1. Connect the bracelet to the charger (use the original cable!).
2. Hold the touch button under the screen for 15-20 seconds until you feel the vibration.
3. Release the button – the bracelet must reboot (the Mi logo will appear).

If the screen is black after that, but the bracelet vibrates when you connect to the charger, the problem may be a damaged display or plume, in which case try connecting to it via Mi Fit — if the data is synchronized, the display is really faulty.

Method 2: Forced reset via charging (if the bracelet is completely discharged)

When the Mi Band 4 is dead and doesn't show any signs of life, a normal reboot won't work -- you first need to wake up the power controller. This uses a button holding + charging connection combination.

Step-by-step:

1. Insert the bracelet into the charger (do not connect to USB!).
2. Press the touch button and, without letting it go, connect the cable to the power source (computer, adapter 5V/1A).
3. Hold the button for another 10-15 seconds until the Mi logo or charging indicator appears.

If the bracelet has started charging but the screen is not turning on, leave it on charge for 1-2 hours. Sometimes after a deep discharge it takes time to recover the battery. Do not use fast charging (more than 1A) - this can damage the controller.

Method 3: Reset via the Mi Fit app (if the bracelet is turned on but is glitchy)

If the bracelet is turned on but is not stable (hangs, synchronization errors, incorrect data), software reset via the official application will help, this method saves user data (steps, pulse), but resets the connection settings.

How to reset your settings:

1. Open Mi Fit and go to the profile of the bracelet (Profile → Mi Smart Band 4).
2. Select to turn off the device (do not delete it!).
3. Confirm the disconnection and reconnect the bracelet via Add the device.

If you have any problems, do a full reset:

1. In Mi Fit, go to Profile → Mi Smart Band 4 → Device Settings.
2. Select Reset to factory settings (all data will be deleted!).
3. Confirm the action and wait for the bracelet to reboot.

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Before resetting, export your health data to Mi Fit: Go to Profile → Settings → Exporting data. This will keep your activity history even after the full reset.

Method 4: Firmware via Mi Band Tool (for power users)

If the bracelet does not respond to either the button or the charge, but is defined by the computer as a USB HID device, you can try to reflash it through third-party software. This method is risky - if the bracelet fails, it can finally fail, but in 60% of cases restores performance after serious failures.

What you need:

• 🖥️ Windows computer 7/10/11 (for Mac/Linux need an emulator).
• 🔌 Original Mi Band 4 cable (not wireless charging!).
• 📁 Gadgetbridge or Mi Band Tool.
• 📄 Firmware for your bracelet version (download from the XDA Developers).

Firmware instructions:

1. Connect the bracelet to the PC via the charger.


2. Launch the Mi Band Tool and select Connect.




3. In the Firmware section, download the firmware file (.fw).




4.Tap Flash Firmware and wait until it is completed (don’t turn off USB!).




5. After the reboot, disconnect the bracelet and connect to the phone via Mi Fit.

⚠️ Attention! Unofficial firmware will void Xiaomi warranty. If the bracelet warranties, contact the service center - self-interference can cause a refusal to repair.

Table: Causes of failure and solutions

What to do if nothing helps: diagnosis and repair

If all reboot methods are exhausted and Mi Band 4 still doesn’t turn on, the problem may be hardware.

• 🔋 The bracelet is not defined as a chargeable device (no indication on charging).
• 💥 The body swelled or there was a smell of burning (battery malfunction!).
• 🖥️ The computer can't see the bracelet even after holding the button.
• 💧 On the screen or under the case, traces of oxidation are visible (infection of moisture).

The cost of repairing the Mi Band 4 in 2026:

• Battery replacement: ~1 200–1 800 ₽.
• Replacement of display/ plume: ~1 500–2 500 ₽.
• Diagnostics + firmware: ~800–1 200 ₽.

⚠️ Attention! Do not disassemble the bracelet yourself - the body of the Mi Band 4 is sealed, and if you open it without special tools, you can damage the board or display. If the device is warranted (period - 12 months), repair will be free when confirming a factory defect.

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Before contacting the service, check whether the warranty period has expired. To do this, find a check or check the activation date in Mi Fit (Profile → Device → Information).

FAQ: Frequent questions about the reboot of Xiaomi Mi Band 4