Fitness bracelet Xiaomi Mi Band 4 can suddenly turn off due to a discharged battery, software failure or mechanical impact. If your gadget has stopped responding to presses and does not show signs of life, do not rush to panic - in 90% of cases, the device can be returned to work without contacting the service center.
In this article, we’ll look at all possible scenarios, from trivial discharge to deep firmware failures, how to distinguish hardware from software failure, what button and charger manipulations will help wake up the bracelet, and when to really think about replacing the battery.
All instructions are tested on the original and cloned versions of the Mi Band 4 (XMSH08HM and XMSH07HM models).If your bracelet is from another series (for example, Mi Band 5/6/7), some methods may not work - consider this before you start manipulating.
1. Checking the underlying causes: charging and mechanical damage
Before you start to do complex manipulations, eliminate obvious problems. Start by visually inspecting the bracelet.
- 🔋 Check the contacts on the back of the bracelet, which should be clean, free of oxidation or contamination. Use alcohol and cotton swab to clean.
- 🔌 Make sure the charger is working properly: try charging another bracelet or check the voltage with a multimeter (should be ~5V).
- 💧 Avoid moisture – if the bracelet is wet, let it dry for 24-48 hours in a dry place (for example, with silica gel).
- 🔨 Inspect the body for cracks or deformities – they may indicate damage to internal components.
If the bracelet does not respond to charging, try alternative power sources:
| power supply | How to connect | Signs of successful charging |
|---|---|---|
| The original adapter Xiaomi | Connect the bracelet to the adapter, then to the 220V outlet | A red indicator on the screen or vibration |
| USB-laptop | Use a smartphone cable with a USB-A connector | Indication of charging may be absent up to 10-15 minutes |
| Power Bank | Connect through the original cable | Vibration or flashing of the screen in 5-20 minutes |
| Wireless charging (Qi) | Place the bracelet on the charging pad with contacts down | It only works on some modifications. |
⚠️ Note: If the bracelet does not charge for more than 30 minutes using different power sources, the problem may lie in a damaged power controller.
2. Forced reboot: hidden touch button function
If the bracelet is not responding to charging, but you are sure that the battery is not discharged (for example, the shutdown occurred immediately after charging), try a forced reboot. This method works even in deep software failures.
Instructions:
Connect the bracelet to the charger (required!)
Press and hold the touch button under the screen for 15-20 seconds.
Release the button after the double vibration
Wait for the Xiaomi logo to appear (it can take up to 1 minute)
Turn off the charge and check the performance-->
If after rebooting the bracelet turned on, but it works unstable (it turns off independently, does not synchronize with the smartphone), reset to factory settings through the Mi Fit application:
- Open Mi Fit. → Choose your bracelet.
- Go to the Device Profile → Further → Reset settings.
- Confirm the action and wait for the process to be completed (the bracelet will reboot).
💡
If the touch button does not respond to the press, try pressing it directly with your nail – sometimes the protective glass or film will block the touch.
Diagnostics of the battery: when replacement is required
The average battery life of the Mi Band 4 is 2-3 years when used actively. If the bracelet is rapidly discharged or does not turn on even after a long charge, the problem may be in the degraded battery.
Signs of a faulty battery:
- 🔋 The bracelet is charged only in a certain position (for example, if you press on the body).
- ⚡ Charging indicator flashes, but battery percentage does not increase.
- 🔄 The device is turned off at a charge level of 30-50%.
- 🌡️ The body heats up during charging.
To check the status of the battery, use the Mi Fit application:
- Connect the bracelet to charging and start the Mi Fit.
- Go to Profile. → Battery.
- If the charge level is not updated for more than 10 minutes, the battery is faulty.
⚠️ Warning: Do not try to open the body of the bracelet yourself - this will lead to loss of leakage (Mi Band 4 has protection 5). ATM). To replace the battery, contact authorized service centers.
How to check the battery without opening the case?
4.Recovery through Mi Fit: Synchronization and firmware update
If the bracelet is turned on but is not working correctly (it does not sync, does not display notifications), the problem may be in outdated firmware or a failure of communication with the smartphone, in which case the reconnection of the device will help.
Step-by-step:
- Remove the bracelet from the device list in Mi Fit (Profile → Delete the device).
- Reboot your smartphone and bracelet (hold the 10 seconds button).
- Turn on Bluetooth and geolocation on your phone.
- Start Mi Fit and start the process of adding a new device.
- When the bracelet appears in the list, select it and wait for the synchronization to complete.
If you're plugged in, you can agree that it can fix software errors.
- 📱 Do not interrupt the update process (it can take up to 30 minutes).
- 🔋 Make sure the bracelet charge level is not below 50%.
- 📶 Connect your smartphone to a stable Wi-Fi network (update via mobile Internet may be interrupted).
💡
Updating the firmware through Mi Fit is the only official way to restore the Mi Band 4 software. Alternative methods (e.g., through Mi Band Tools) can result in a loss of warranty.
5. Hardware reset: last resort for deep failures
If none of the previous methods worked, then you have hardware reset, which is a complete flashing of the bracelet through the service menu, and this requires care, because the wrong actions can permanently bring the device down.
For hardware reset, you will need:
- 🖥️ Windows computer 7/10/11.
- 🔌 Original cable for charging Mi Band 4.
- 📁 Firmware archive (download from the official Xiaomi website or forum) 4PDA).
- 🛠️ Mi Band 4 Tool or Gadgetbridge.
Instructions:
- Connect the bracelet to the computer through the charger.
- Start the Mi Band 4 Tool and select Force FW Update.
- Specify the path to the firmware file (.fw or.bin format).
- Press Start and wait for the process to be completed (the bracelet will reboot several times).
⚠️ Warning: Hardware reset erases all data from the bracelet, including activity history. After the procedure, you will need to reconfigure via Mi Fit. If the bracelet is not determined by the program, check the drivers. USB Or try another computer.
If the hardware reset didn't work, there's probably a problem with a damaged memory chip or other hardware components, in which case, contact the service center.
6. Alternative methods: if nothing works
When standard methods fail, you can try non-obvious solutions that sometimes help to “resuscitate” the bracelet.
The cold start method:
- Place the bracelet in a sealed bag of silica gel (or rice) for 12 hours - this will remove the possible condensation.
- Connect to charging and leave for 2-3 hours without trying to turn on.
- Press and hold the touch button for 30 seconds, then release.
The “repose” method (only for experienced users!):
How to perform a repolarization of contacts?
Use of third-party applications:
- 📱 Notify & Fitness for Mi Band – Mi Fit alternative with advanced diagnostic features.
- 📱 Mi Band Master – allows you to reset settings without official software.
- 📱 Gadgetbridge – open source software for working with wearable devices (requires root rights on a smartphone).
If the bracelet never turned on, check it on another smartphone (preferably with Android 8.0+ and the original Mi Fit).