How to check the work of Bluetooth on a Xiaomi smartphone: from basic diagnostics to hidden tests

The Bluetooth module in Xiaomi smartphones is one of the most popular components: it depends on the stability of wireless headphones, fitness bracelets, smart watches and even some functions of car multimedia. The devices are gone, the connection is cut, the sound is interrupted, or the module is not turned on at all. MIUI, and in hardware malfunctions.

This article will help diagnose Bluetooth on any Xiaomi smartphone, from the budget Redmi Note to the flagship Mi 13 Ultra. We will examine both standard methods of checking through settings and hidden engineering tests that service centers use. Importantly, some methods require developer rights or special applications, but all of them are safe when executed correctly.

If you suspect that the problem is not in the smartphone, but in the connected device (for example, in headphones), first check their compatibility with your Xiaomi model, A2DP, AVRCP, LE) You can find the technical specifications on the official website.

1. Basic verification through Android settings

Start with the simplest: turn on Bluetooth and try to connect any compatible device, and even if the connection does not establish, this test will help identify obvious problems.

How to do this:

• 📱 Open the Settings. → Bluetooth (or Settings) → Connections → Bluetooth in new versions MIUI).
• 🔄 Transfer the slider to the "On" position (if it is already active, turn it off and turn it on again).
• 🔍 Click “Search for devices” and wait until the smartphone finds available gadgets.
• 🎧 Try connecting to headphones, a speaker, or another phone.

What should alert you:

• ❌ Bluetooth does not turn on at all (the slider returns to the “Off” position.»).
• ❌ The smartphone does not find any devices, although they are nearby and are included.
• ❌ Devices are located, but an error is issued when connecting (for example, “It was not possible to hide the device»).
• ❌ Bluetooth audio is interrupted or distorted.

⚠️ Note: If Bluetooth is turned on but does not find the device, check if Hidden mode is activated on the plug-in. For example, some Xiaomi headphones are not displayed in the default list of available devices.

2. Verification through "Developer Mode"

Android’s hidden settings allow you to get detailed information about the status of the Bluetooth adapter, including the protocol version, MAC-This method works on all Xiaomi smartphones, but requires pre-enabled developer mode.

How to activate the developer mode:

1. Go to Settings. → The phone.
2. Find the MIUI version and tap it 7 times in a row.
3. Enter the pattern lock or PIN-code, if required.
4. Return to the main settings menu and a new section for developers will appear.

Now we're checking Bluetooth:

• 🛠️ Go to Settings. → For developers → Bluetooth.
• 📊 Scroll down to Bluetooth Information (or Bluetooth Status).
• 🔍 Please note the following parameters: Address — MAC-The address of your adapter (should be in the format) XX:XX:XX:XX:XX:XX). Version - current version of the protocol (e.g. 5.2 or 5.3) State - must be On or Active.

⚠️ Note: If the Bluetooth Information section displays an error Unknown or the settings are not loaded, this may indicate a hardware failure of the module.

Is the developer mode activated?|Is it displayed correctly? MAC-address|Does the Bluetooth version match the specifications?|There are no errors in the status of the module-->

3. Testing through the engineering menu (#4636##)

Xiaomi smartphones have a hidden engineering menu that allows you to check the operation of all wireless modules, including Bluetooth. This method does not require root rights, but be careful: changing some parameters can disrupt the stability of the system.

How to open the engineering menu:

1. Open the Phone app.
2. Enter the combination: ##4636### (some models may require ##225###).
3. Select Phone Information (or Testing in English firmware).

Next:

• 📡 Scroll down to the Bluetooth section.
• 🔧 Press the Run Ping Test (or similar item).
• 📊 Wait for the results: if the test is successful, the module works correctly.

In addition, in the engineering menu you can:

• 📋 View the connection log (Bluetooth Log).
• 🔄 Restart the module (Restart Bluetooth).
• 📱 Check compatibility with other devices (Device List).

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If the engineering menu doesn't open, try entering the combination through the Calculator app (enter a sequence of numbers and characters, like on your phone).

4.Diagnostics through Analyzer Applications

If standard methods fail, use third-party utilities that allow you to check the Bluetooth signal, data rate and compatibility with other devices.

• 📊 Bluetooth Scanner – Scans nearby devices and shows signal strength (RSSI).
• 🔧 Bluetooth Auto Connect – tests connection stability and automatically reconnects when a break occurs.
• 📡 nRF Connect – Professional Verification Tool BLE (Bluetooth Low Energy).
• 🛠️ DevCheck – Shows detailed information about the module, including supported code (SBC, AAC, aptX).

How to use DevCheck:

1. Install the app from Google Play.
2. Open the Hardware tab.
3. Find the Bluetooth section – here are displayed: Protocol version; Supported profiles (A2DP, HFP List of associated devices; Current status of module.

If DevCheck displays a Bluetooth not available message, it could mean:

• 🔌 The module is disabled at the hardware level (for example, after the fall of the smartphone).
• 📱 Firmware failure (will help flashing through Fastboot).
• 🛠️ Problems with the motherboard (requires diagnosis in the service center).

5. Verification of compatibility with other devices

Sometimes Bluetooth on Xiaomi works correctly, but it can't connect to a particular device, because it's due to conflicting protocols or codes. WH-1000XM5 use LDAC, Which may not be supported by older Xiaomi smartphones.

How to check compatibility:

1. Find out which codec your audio device uses (the information is in the manual or on the manufacturer’s website).
2. Compare it to your Xiaomi codecs supported (you can find out through DevCheck or official specs).
3. If the codec doesn’t match, try manually selecting another in Bluetooth settings: Open Settings → - Bluetooth, hit the badge. ⚙️ Select the audio codec (if available).

General recommendations on compatibility:

• 🎵 It's better to use it for music. AAC AptX (less latency, better quality).
• 📞 It's good for calls. HFP or mSBC.
• ⚠️ Codec SBC It is universal, but gives the worst sound quality.

⚠️ Note: On some Xiaomi smartphones (e.g. Redmi Note 10 Pro), a forced codec change can cause a connection to break. If the code change has left the sound, return the settings to the factory.

6. Hardware diagnostics (if Bluetooth is not turned on)

If none of the software methods worked, the problem could be a physical malfunction of the module.

• 🔧 Check the Bluetooth antenna (often combined with a Wi-Fi antenna).
• 🔌 Check the connector of the module on the motherboard (may be oxidation or drop of contacts).
• 📱 Check the power of the module (if the charge is not applied voltage, Bluetooth will not turn on).

On Xiaomi smartphones, the Bluetooth module is usually located next to the processor and is marked as BCM (Broadcom or QCA (For example, the Redmi Note 11 uses a Qualcomm chip. WCN6750, which is responsible for both Wi-Fi and Bluetooth.

Signs of hardware malfunction:

• ❌ Bluetooth does not turn on even after resetting.
• ❌ Bluetooth does not work with Wi-Fi.
• ❌ The engineering menu displays the Hardware Failure error.
• ❌ The smartphone overheats in the upper part (where the module is located).

What to do:

1. Take your smartphone to Xiaomi’s service center for diagnosis.
2. If the warranty expires, you can try to solder the module yourself (but it is risky!).
3. Check if there were any mechanical damage (falls, moisture).

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If Bluetooth stopped working after falling or getting moisture, the most likely problem is the tipping of the contacts or corrosion on the board, in which case only repairs will help.

7. Resetting and flashing

If all the tests indicate a software failure, try to return the smartphone to factory condition, which will remove all the associated devices and reset the Bluetooth settings.

How to reset:

1. Go to Settings → About the phone → Reset settings.
2. Select Network Settings Reset (this will remove all stored Wi-Fi and Bluetooth devices).
3. If it doesn’t work, do a full reset (delete all data!).

If the reset did not help, try to reflash the smartphone:

• 📥 Download the official firmware for your model from en.miui.com.
• 🔧 Use the Mi Flash Tool to Fastboot Firmware.
• 🔄 After the firmware check Bluetooth again.

⚠️ Attention: Fastboot flashing deletes all data and can lead to a bootloader lock if you don't follow the instructions!

FAQ: Frequent questions about Bluetooth on Xiaomi