Xiaomi headphones work separately: 7 ways to fix the disconnect

You took out a Xiaomi AirDots or Redmi Buds headphone, but instead of the usual stereo sound, you hear music in only one of them? Or do both headphones connect to your phone as separate devices? This problem is familiar to many owners of Xiaomi wireless headphones — and the good news is that 90% of the time it can be solved by yourself in 5-10 minutes.

Headphone disconnection usually occurs due to a left-right sync failure, firmware errors, or incorrect Bluetooth settings. In this article, we will discuss 7 proven ways to return stereo sound, from simple reset to manual flashing. And you will learn why the problem occurs most often in the models Xiaomi Mi True Wireless Earphones 2 and Redmi AirDots 3 Pro, and how to avoid it in the future.

Before you start repairing, make sure the problem isn't with the sound source. Try connecting the headphones to another smartphone or PC -- if they're working properly, your device settings are to blame. If disconnection persists, read on.

1. Quick reset of Xiaomi headphones through the button

The most versatile method that works for most models – from AirDots Youth Edition to Buds 4 Pro. Resets all settings of the headphones, including paired Bluetooth keys, and makes them sync again.

Instructions:

• 🔋 Put both earphones in the case and close the lid. Make sure the indicator on the case flashes (means charging is underway).
• 🔄 Press and hold the button on the case (usually located behind or below) for 15-20 seconds until the indicator starts flashing red and white alternately.
• 📱 Open the cover of the case, the headphones should automatically turn on and sync. If that doesn't happen, pull them out manually.
• 🔗 Connect to your headphones via Bluetooth as a new device (the name will show as Mi True Wireless or similar).

⚠️ Attention: On models of Xiaomi Buds 3T The Pro and the newer reset button can be touch-sensitive, in which case hold your finger on the sensor area (usually marked by a dot) until the indicator flashes twice.

Make sure the headphones are charged (the indicator on the case is lit green)|Put both headphones in the case and close the cover|Press and hold the reset button for 15-20 seconds|Wait for the flashing red/white|Connect again via Bluetooth-->

2. Manual pairing of left and right earphone

If the reset didn't work, the headphones may have lost touch with each other, in which case they need to be forced to sync manually, a technique that is suitable for models with physical buttons on the body (for example, Redmi AirDots S or Mi Basic 2).

Step-by-step:

1. Take both headphones out of the case and turn off Bluetooth on the phone.
2. Press and hold the button on the right earphone for 5 seconds until the indicator starts flashing quickly white.
3. Repeat the same for the left earpiece.
4. Wait 10-15 seconds – the headphones should automatically find each other and sync (the indicators will light up constantly).
5. Connect to them via Bluetooth. The device name should appear as a single unit (e.g. Redmi). AirDots_S, Not Redmi. AirDots_S_L redmi AirDots_S_R separately).

💡 If the lights flash alternately red and blue, it means that the headphones are looking for each other, but can not connect.

3. Update firmware via Mi Fit or Xiaomi Wear

Outdated firmware is one of the main reasons for the disconnection of headphones. Xiaomi regularly releases updates that fix synchronization bugs, especially for the Buds 3 Pro and AirDots 3 models. You can update the firmware through official applications:

How to update firmware:

1. Install the appropriate app from Google Play or App Store.
2. Connect the headphones to the phone via Bluetooth.
3. Open the app and go to the Devices section → [Your model] → Firmware update.
4. If a new version is available, click Update and wait for the process to complete (don’t turn off the headphones!).

⚠️ Warning: If the headphones are gone during the upgrade and the process is 0%, do not remove them from the case and restart the phone. Wait 10 minutes - usually the update resumes automatically. If not, reset (see section 1).

4. Verification of compatibility with the sound source

Sometimes the problem isn't with the headphones, but with the device they're connected to. For example, some Android 12+ or iOS 16+ smartphones may not recognize stereo pairs correctly because of bugs in Bluetooth 5.2.

• 📱 On Android: Go to Settings → Bluetooth, find your headphones on the list and click on the gear next to the name. Make sure that the audio setting is on (AAC/aptX). If only available SBC, This could be the reason for the separation.
• 🍎 On iPhone: Go to Settings → Bluetooth → i (information) next to the headphones and turn off the option Automatic switching devices.
• 💻 On PC (Windows) 10/11): Open the settings. → Devices → Sound, select your headphones and set the format in the properties 16 bit, 44100 Hz (Quality) CD).

Critical information: Headphones Xiaomi Buds 3 Pro and later do not support the codec aptX on Apple devices due to the limitations of the Qualcomm chipset.If you connect them to the iPhone, the sound will only be transmitted over AAC, which can cause delays and disconnections.

5.Bleaking contacts and checking the cover

The charger case is not just a battery, it's a key synchronization element. If the contacts between the headphones and the case are contaminated or oxidized, the headphones may not correctly identify each other when connected.

Clearing contacts:

• 🧹 Take a cotton swab dipped in isopropyl alcohol (at least 70%).
• 🔍 Gently wipe the metal contacts on the headphones and inside the case (especially if oxidation or plaque is visible).
• ☀️ Let it dry for 5-10 minutes before use.

Checking the case:

• 🔋 Make sure the case is charged (the indicator should be green or white when connected to the charger).
• 🔄 Try connecting the case to another cable/charger – sometimes the problem is insufficient voltage.
• 🛠️ If the case is swollen or deformed, it is a sign of a malfunction of the battery.

💡 If the headphones don't sync after cleaning, try putting them in a case and plugging the case into a charger for 30 minutes.

6. Flashing through Engineering Mode (for advanced)

If all previous methods have failed and headphones are still defined as separate devices, you can try manual flashing through the engineering menu, which is only suitable for models on Qualcomm QCC3040 chipsets or later (for example, Xiaomi Buds 3 Pro, AirDots 3).

⚠️ Attention: The wrong actions in Engineering Mode can permanently disable your headphones. Use this method only if you are confident in your skills or under the supervision of a specialist.

Instructions:

1. Download the QCC30XX Tool (for Windows).
2. Connect the headphones to your PC via Bluetooth (they should be defined as separate devices).
3. Start the utility and select the port of your Bluetooth adapter.
4. Enter the command to reset the paired keys: AT+BTDEV=0.0.0 Then the command to force synchronization: AT+SYNC=1
5. Reset the headphones (put them in the case and take them back out).

If the utility does not recognize headphones, try using the QN908XCDK for models on NXP QN9080 chips (for example, Redmi Buds 3 Lite).

💡

Before flashing, be sure to check the chipset model of your headphones! improper firmware can lead to loss of functionality.

7. When to contact the service center

If neither of these methods worked, and the headphones still work separately, the problem may be hardware.

• 🔊 One of the headphones does not turn on at all (the indicator does not flash).
• 🔋 The case does not charge the headphones (even after cleaning the contacts).
• 📡 Headphones are connected as separate devices on all tested gadgets.
• 💥 After reset, the indicators flash red and do not respond to buttons.

📌 Where to repair:

• Official Xiaomi service centers (list on the manufacturer's website).
• Authorized partners (e.g., Connected Services or iService)
• Local workshops with good reviews (check on Yandex.Maps or 2GIS).

⚠️ Warning: If headphones are warranty, do not open them yourself - this will cancel the warranty obligations.

The cost of repair varies from 800 to 2500 rubles depending on the model and breakdown. For example, replacing the battery in one headphone will cost ~ 1200 rubles, and soldering Bluetooth module - up to 2000 rubles.

FAQ: Frequent questions about the separation of headphones Xiaomi