How to bring back to life Xiaomi Mi Band 4: step-by-step instructions for resuscitation of the bracelet

Xiaomi Mi Band 4

7 proven methods of resuscitation

Many users mistakenly think that if the Mi Band 4 does not respond to charging or does not vibrate when connected, it is time to throw it away. In practice, 9 out of 10 dead bracelets recover after correct manipulation. The main thing is to act consistently and not miss steps. We will analyze both hardware problems (contacts, battery) and software problems (firmware failures, synchronization errors).

If your bracelet:

• 🔋 It does not charge (the indicator does not burn)
• 🖥️ Not activated after the update
• 💀 Completely dead (no reaction to the button)
• 🔄 Hanging on the Mi logo.
• 📱 Not synchronized with the phone.

So this is the instruction for you, and let's start with the simplest methods, and then gradually move on to the complex ones.

1. Charging check: why the bracelet doesn't respond to the cable

The first thing to rule out is power problems. The Mi Band 4 may not charge for three reasons: a faulty cable, a contaminated contacts, or a damaged battery.

✅ Cable: Use only original or certified cable USB-Xiaomi cables, cheap ones often don't provide the voltage you need, try connecting the bracelet to another power source -- sometimes a problem with power banks. USB-charger.

✅ Contacts: There are 4 gold contacts on the back of the bracelet (two extreme ones for charging, two central ones for data transmission). Take a cotton swab, moisten it in alcohol and clean the contacts carefully. Oxide film or dirt can block charging even with a proper cable.

✅ Indication: When you connect to a charge, the battery icon should appear on the screen. If it is not there, but the bracelet is slightly heated, most likely, a problem in the display. If it does not heat up at all, you may break the chain or fail the battery.

⚠️ Warning: Do not use needles or metal objects to clean contacts! this can damage the coating and impair conductivity.

If the bracelet does not charge after cleaning the contacts, try an alternative method of connection:

• 🔌 Connect the cable to USB-port of the computer and check if the device is detected in Device Manager (section "Ports" COM and LPT"). If yes, the problem is in the firmware, if not in the hardware.
• 🔋 Try charging the bracelet from another power supply with the output 5V/1A (Sometimes, a lack of current leads to a false alarm.

2. Forced reset: how to "reset" the bracelet

If the Mi Band 4 is stuck on the logo, doesn't respond to touch, or gives out synchronization errors, a hard reset will help, which resets temporary data in memory, but does not affect the main firmware.

📌 Instructions for forced resetting:

1. Remove the bracelet capsule from the strap.
2. Connect it to the charging cable (whether it’s a network or a computer).
3. Press and hold the touch button under the screen for 15-20 seconds.
4. Release the button when the Mi logo appears on the screen.

If the bracelet does not respond to the button holding, try an alternative method:

• 🔄 Turn off the bracelet from charging.
• Press the button 10 times in a row at intervals of 1 second.
• Connect to charging and hold the button for another 10 seconds.

After the reboot, the bracelet should turn on normally. If this does not happen, move on to the next step.

💡

If the bracelet freezes regularly, check the firmware version in the Mi Fit app. Updating to the latest version often solves the problem.

3. Reset to factory settings: when nothing helps

If the forced reset fails, the next step is a hard reset, which deletes all user data (steps, settings, alarm clocks) but keeps the firmware running.

⚙️ How to make a hard reset on Mi Band 4:

Once reset, the bracelet will reboot and return to factory settings, and you will need to re-synchronize it with the Mi Fit app.

🔍 What to do if the reset does not work:

• 🔌 Try to reset without connecting to a charge (sometimes the protection blocks the command when powered from the battery). USB).
• 📱 Make sure the bracelet has enough charge (at least 10%) and the battery is discharged may not be complete.
• 🔄 Repeat the procedure 2-3 times with an interval of 1 minute.

⚠️ Warning: After hard reset, all data on the bracelet will be deleted, including the link to the Xiaomi account.

4. Manual firmware update: if the bracelet is not turned on after the update

One of the most common causes of Mi Band 4 death is a failed firmware update, and if the bracelet is stuck during the upgrade installation phase or stopped turning on immediately after it, manual flashing will help.

📂 What's the matter:

• 🖥️ Windows computer 7/10/11.
• 🔌 Original. USB-cable from Mi Band 4.
• 📁 Firmware for your version of the bracelet (you can download on the official forum Xiaomi).
• 🛠️ Utility. MiBand4Tools or Gadgetbridge.

🔧 Step-by-step instruction:

1. Download the archive with firmware and unpack it in a folder.
2. Connect the bracelet to the computer through USB-cable.
3. Launch it. MiBand4Tools Select the option "Flash firmware".
4. Specify the path to the firmware file (usually a file with the.fw extension).
5. Press Start and wait until the process is completed (about 5-10 minutes).

⚠️ Important nuances:

• 🔋 Don't turn off the bracelet. USB It can cause a complete failure of the firmware.
• 📋 Before you run the firmware, check the version of your bracelet (on the case or in the Mi Fit settings, NFC-The standard version of the bracelet will make it inoperable.
• 🔄 If the utility does not see the device, try reconnecting the cable or using another one. USB-port.

5. Battery check: when the bracelet discharges in an hour

If the Mi Band 4 turns on but discharges in a few hours or turns off at the slightest load, the problem is most likely the battery. The average battery life in Xiaomi bracelets is 2-3 years, after which the capacity drops by 30-50%.

🔋 How to Diagnose a Battery Failure:

• 📊 Check the discharge schedule in the Mi Fit app. If the battery sits down evenly, it's a problem with wear. If the percentage drops sharply from 30% to 0%, the charge controller is faulty.
• 🔥 Feel the bracelet body while charging. if it gets too hot (over 40)°C), this is a sign of battery failure.
• ⚡ Connect the bracelet to charge and watch the indicator. If the charging is jerking (it appears, the battery icon disappears) - the problem is in the contacts or the battery itself.

🛠️ Can I replace the battery by myself?

Theoretically yes, but in practice it is difficult.

• ✅ Pros: the new battery costs 300-500 ₽, Replacement is cheaper than buying a new bracelet.
• ❌ Cons: the body of the Mi Band 4 is glued together, you need a hair dryer and plastic mediators to disassemble. The risk of damage to the display or board is 50%.

If you decide to replace, follow the instructions:

1. Heat the body with a hair dryer (temperature 60–70)°C) for 2-3 minutes.
2. Carefully tuck the back cover with a plastic mediator.
3. Disconnect the battery plume from the board (it is glued, do not pull by force!).
4. Install a new battery and assemble the bracelet in reverse sequence.

⚠️ Warning: When replacing the battery, do not use metal tools - this can cause a short circuit.

6. Recovery after water intrusion

Xiaomi Mi Band 4 has protection by standard IP68, But that doesn't mean it can withstand prolonged immersion or salt water. If the bracelet stops working after contact with the fluid, act quickly:

💧 Emergency measures (first 30 minutes):

• ⏱️ Remove the bracelet from the water immediately and disconnect from charging (if connected).
• 🧻 Wash the body with a dry wipe without pressing the button.
• 🔋 Do not turn on the bracelet or press the screen – this can cause a short circuit.
• 🌬️ Place the device in a silica gel container (shoe box bags) for 24 to 48 hours.

🔧 What to do after drying:

1. Try turning on the bracelet. If it doesn't respond, plug it into a charger.
2. If the bracelet is turned on but is unstable (self-reboots, artifacts on the screen), reset to factory settings.
3. Check the sensor: If the screen does not respond to touch, the plume contacts are likely to have oxidized.

🚫 What can't be done:

• 🔥 Dry the bracelet with a hair dryer, on a battery or under direct sunlight - this can deform the body and damage the battery.
• 🧂 Use rice to dry – it does not absorb moisture as efficiently as silica gel, and particles can get inside the device.
• 🔌 Connect to charging if the bracelet is wet is the main reason for failure after water hits.

If the bracelet is not turned on after drying, the board is likely damaged, in which case home restoration is impossible - replacement of components in the service center is required.

💡

Even if the bracelet is turned on after water and works normally, for a week watch its behavior. corrosion of contacts may not appear immediately, but after a few days lead to breakage.

7. When to contact the service center

If none of these methods worked, the problem may be more serious than it seems, and here are some signs you should consult a specialist.

🛠️ Symptoms of critical breakdowns:

• 🔥 The bracelet is very warm even without charging (the risk of battery fire).
• 💥 On the body visible swelling or cracks (damaged battery).
• 🖥️ Vertical stripes or artifacts appear on the screen (display or plume is damaged).
• 🔌 The bracelet is not detected on any device (damaged board).
• 📵 Complete lack of response to charging and button (power controller burned).

💰 Cost of repairs in service centers:

❓ Is it better to repair or buy a new one?

If the cost of repair exceeds 50% of the price of a new bracelet (about 2,500). ₽ For the Mi Band 4, it is more logical to consider buying an updated model (for example, Mi Band 7 or Mi Smart Band 8). NFC-A version or bracelet with a rare design, repairs may be warranted.

📍 Where to look for service centers:

• 🏢 Official Xiaomi SC (list on the site mi.com).
• 🔧 Unofficial workshops with good reviews (check on Yandex.Maps or 2GIS).
• 🛒 Services at large electronics stores (for example, Svyaznoy or M. Video).

⚠️ Warning: Before handing over the bracelet for repair, back up the data in Mi Fit (if it is still turned on) and untie it from your account.

FAQ: Frequent questions about Mi Band resuscitation 4