How to check the Xiaomi Mi Band: from sensors to batteries

Xiaomi Mi Band fitness bracelets have become an integral part of the daily lives of millions of users, but even the most reliable technology can fail. Problems vary from sudden shutdown to incorrect display of pulse or step data. Causes range from software errors to physical damage. This article will help systematize the check of your bracelet, identify problems and determine whether they can be fixed on their own.

We're going to look at 7 key diagnostics, from basic connection testing to sensor testing to battery status analysis. We're going to focus on the Mi Band 5/6/7 and Smart Band 8, but most of the methods are universal for all generations. If you notice that the bracelet started to run out in a few hours, stopped syncing with your smartphone or shows a clearly inflated number of steps, here you'll find step-by-step instructions for each case.

Important: Some problems (such as a touchscreen failure after moisture) require professional repair, but 80 percent of the time, users successfully restore the device to work after proper diagnosis.

1. Checking connection and synchronization with the smartphone

The first step is to make sure that the bracelet interacts correctly with the Mi Fitness app (formerly Mi Fit).Sync disruptions are often mistaken for hardware malfunctions.

• 📱 Update app: The outdated version may not support new bracelet features. check for updates on Google Play or App Store.
• 🔄 Reboot both devices: Turn off the bracelet (press the touch button for 10 seconds) and restart the smartphone. Once turned on, try syncing the data again.
• 📶 Check Bluetooth: Make sure your smartphone is Bluetooth enabled and there are no active connections to other devices (earbuds, speakers).
• 🔗 Reset the connection: In the Mi Fitness app, remove the bracelet from the list of devices (Profile) → Devices → Forget this device) and re-bind.

If synchronization is not restored, try an alternative method of connection:

1. Open on your smartphone Settings → Bluetooth.
2. Find the Mi Band X device list (where X is your bracelet model) and click Forget.
3. In the Mi Fitness app, initialize a new connection by following the on-screen prompts.

⚠️ Note: If the bracelet is not detected by the application or in the list of Bluetooth devices, this may indicate a malfunction of the communication module.

2. Touch screen and button testing

A non-response screen or button sticking is a common problem after falls or contact with water.

• 🖐️ Sensor check: Swipe your finger all over the screen, and you'll have a uniform response. AMOLED-with a display (e.g. Mi Band 7 Pro) check the display of colors.
• 🔘 Physical button test: Press the button under the screen (if any) 10-15 times. Delays or double positives indicate mechanical wear and tear.
• 💧 After moisture check: If the bracelet is wet, dry it in rice or silica gel for 12 to 24 hours!

For a deep screen diagnosis:

1. Go to Bracelet Settings → About device → Screen test (not available on all models).
2. If you don’t have one, use third-party apps like Notify & Fitness for Mi Band (requires root rights on some firmware).

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If the screen is covered with a protective film, removing it can restore the sensitivity of the sensor. Use the plastic card for neat removal.

3. Diagnosis of sensors: pulse, pedometer, SpO₂

Sensors are the heart of a fitness bracelet, and their malfunctioning leads to false health data, starting with a heart rate sensor.

• ❤️ Pulse test: Compare the bracelet readings to the data of a medical pulse monitor or smartphone app (e.g. Google Fit). A difference of more than 10% is cause for concern.
• 👟 Pedometer check: Walk exactly 50 steps with your smartphone in your hand. Compare the data in Mi Fitness and the phone's built-in step counter.
• 🩺 SpO₂ (oxygen saturation: Measurements should be taken at rest; normal values are 95-100%; if the bracelet is below 90% for no apparent reason, the sensor is defective.

For pedometer calibration:

1. In the Mi Fitness app, go to Profile → Settings → Accuracy of steps.
2. Specify height and weight, and this will improve the calculation algorithms.
3. Take a test measure: walk 100 steps with your phone in your pocket. If the difference with the bracelet is more than 5%, reset the sensor settings (Pedometry Data Reset).

⚠️ Attention: Mi Band sensors are not medical devices, use professional equipment to diagnose serious illnesses. SpO₂ below 92% may indicate hypoxia, but the bracelet does not replace the pulse oximeter.

Compare pulse readings with a medical device|Check the pedometer at a distance of 50 steps|Measure. SpO₂ restless|Clean the back of the bracelet from contamination|Update the firmware to the latest version-->

Analysis of battery and charging status

A quick discharge or failure to turn on are signs of battery problems.

• ⚡ Cable and adapter check: Use the original Xiaomi cable. connect the bracelet to another USB-port.
• 🔋 Battery test: Completely discharge and charge the bracelet 2-3 times in a row. If the battery time does not increase, the battery degrades.
• 🔌 Charging contacts: Clean the contacts on the bracelet and charger with a cotton swab soaked in alcohol.

To assess battery wear:

1. Install the Mi Bandage app (requires root on some devices).
2. In Battery Info, see Capacity and Voltage, normal voltage 3.7-4.2V.
3. Compare the current capacity with the passport capacity (for example, the Mi Band 7 has a battery of 125 mAh), a drop in capacity below 70% of the nominal value is a reason to replace.

5. Check firmware and updates

Outdated software is the cause of many failures. Updating firmware often solves sensor, synchronization and autonomy problems.

1. Open the Mi Fitness app and go to Profile → Devices → Firmware Update.
2. If the update is available, plug the bracelet into charging and wait for the process to complete (don’t turn it off!).
3. After the update, reset the settings (Settings → Reset).

If the automatic update does not work:

• 🌐 Manual installation: Download the firmware from the official Xiaomi website (support section) and install via Mi Fitness.
• 🔧 Reverse version: If after the update there are bugs, go back to the previous firmware with the help of Mi Bandage.

⚠️ Warning: Do not interrupt the upgrade process! This can lead to a "brick" (completely inoperable) of the bracelet. If the firmware is suspended during the installation phase, wait for the battery to completely discharge and try again.

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Regular firmware updates not only add new features, but also fix critical sensor errors. For example, in Mi Band 7, upgrading to version 1.17.0.14 eliminated the problem of false pedometer positives.

Diagnostics of physical injuries

Falls, impacts and contact with water leave a mark on the bracelet, and an external examination will help to identify obvious defects:

• 🔍 Body: Cracks, chips or bloating (a sign of a damaged battery).
• 💦 Water protection: On models with 5 ATM (For example, Mi Band 7 Pro, check the rubber seals. If they're deformed, the leakage is broken.
• 🔌 Charging contacts: Oxidation or pollution leads to poor contact.

To check the water protection:

1. Immerse the bracelet in water to a depth of 1 meter for 30 minutes (only for models with 5 ATM!).
2. After removal, wipe with a dry cloth and check the performance.
3. If the screen is sweaty or the bracelet has stopped turning on, the moisture protection is broken.

Signs of critical damage:

• The bracelet heats up when charging or working.
• Spontaneous reboots.
• The appearance of artifacts on the screen (strips, flickering).

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If the bracelet fell from a height of more than 1 meter, check the mounting of the display. On models of Mi Band 6/7, the screen is held on double-sided tape, which can unstuck.

7. Reset to factory settings

If the previous steps didn't work, do a full reset, which will return the bracelet to its original state and eliminate software failures.

Method 1: Through the Mi Fitness app:

1. Go to Profile → Devices → Bracelet settings → Reset.
2. Confirm the action and wait for the reboot.

Method 2: Hardware reset (if the bracelet is not synchronized):

1. Turn off the bracelet from charging.
2. Press the touch button for 20-30 seconds until the Mi logo appears.
3. After reset, re-bind to Mi Fitness.

⚠️ Warning: Reset removes all data from the bracelet, including alarm clock settings and workouts.

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Factory resetting helps in 60% of software errors, but it will not restore physically damaged components (sensors, battery).

FAQ: Frequent questions about the Xiaomi Mi Band check