How to set up the left headphone Xiaomi: from synchronization to resetting settings

If your left-hand Xiaomi earphone has stopped working, it makes a quiet sound or does not connect at all, do not rush to bring it to the service. In 80% of cases, the problem is solved by software setting or a simple reset. This article will help you understand why the AirDots Pro 2, Buds 4 Pro or other Xiaomi models behave incorrectly, and what to do about it.

We're going to look at all the scenarios, from basic synchronization to deep reset through the engineering menu, and we're going to look at why the left earphone can fall behind the right earphone, why it discharges faster, and how to fix it. If you've never set up a wireless headphone before, don't worry: the instructions are good for beginners.

1.Why Xiaomi's left-hand earphone doesn't work: the main reasons

Before you jump into the settings, it’s worth understanding why the left earbud is acting strange, because in most Xiaomi models (like the AirDots 3 Pro or Buds 3T Pro), the right earbud is the lead one — it connects directly to the phone, and the left one syncs to it via a separate channel, which means that problems with the left earbud are often related to:

• 🔋 Discharged battery - the left earphone can discharge faster due to the features of the power scheme.
• 📶 Synchronization interference – if there is an obstacle between the headphones (such as the user’s head), the signal may be interrupted.
• 🔄 Failure of firmware - after updating or abruptly disconnecting the headphones can "forget" each other.
• 🎧 Mechanical damage - ingress of moisture, fall or wear of contacts in the case.

Interesting fact: Xiaomi Buds 4 and later uses dual-connection technology, where both headphones can work independently, but even then, the left one often falls off due to errors in the role allocation algorithm.

⚠️ Attention: If the left earphone does not turn on at all (the indicator does not blink, does not respond to presses), the problem may be in the contacts of the charging case.

Basic synchronization: how to connect the left earphone to the right

If the headphones are disconnected (for example, after a reset or update), they need to be synchronized again. In most Xiaomi models, this is done automatically when removed from the case, but sometimes the process is lost.

1. Place both headphones in the charger case and close the lid for 10 seconds.
2. Only take out the right earphone – it should start flashing white/red (search mode).
3. Connect to it via Bluetooth on your phone (the model name, for example, Mi True Wireless Earphones 2, will appear in the list of devices).
4. After successful connection, remove the left earphone – it should automatically synchronize with the right (the indicator blinks blue).

If the synchronization has not occurred:

• 🔄 Reboot both headphones by holding the button for 15 seconds (until double blinking).
• 📱 Remove the device from the list of conjugates in the Bluetooth settings of the phone and reconnect.
• 🔋 Check the case charge – at a level below 20%, the headphones may not sync.

3. Resetting Xiaomi headphones: when and how to do

If the basic synchronization didn't work, you'll have to reset the headphones completely, and it'll bring them back to the factory settings, and it often solves problems with connecting the left earphone, and you'll have to reconnect the device to the phone after the reset.

Instructions for most models (AirDots 2/3, Buds 3 Pro, FlipBuds Pro):

Make sure that both earphones are in the case.|Close the case cover for 5 seconds|Open the lid and hold the button on the case for 20 seconds (until flashing red)|Wait for the double white flashing - reset is complete|Connect your headphones again via Bluetooth-->

For touch-controlled models (e.g. Buds 4):

1. Put the headphones in the case.
2. Touch and hold the touchpads on both headphones simultaneously for 10 seconds.
3. The indicators should flash red → white-coloured.

⚠️ Note: In Xiaomi AirDots Pro models 2S and Buds 3T Pro after reset may need to update the firmware through the Mi Home app. without this, the left earphone will work intermittently.

4. Sound tuning: why the left earphone is quieter than the right

A common complaint of users is the different volume levels in the headphones, which can be due to both the settings of the phone and the features of the headphones themselves.

In Xiaomi Buds 4 Pro and later, there is a feature called Adaptive Sound, which automatically adjusts the volume depending on the surrounding noise, and sometimes it gets lost to reset it.

1. Open the Mi Home app.
2. Select your headphones → Sound settings → Reset the equalizer settings.
3. Turn off the Adaptive Sound option for 1 minute, then turn it on again.

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If your model doesn’t have a separate audio balance setting, try using third-party apps like SoundAssistant (for Samsung) or Wavelet (for all Androids), which allow you to fine-tune the volume of each earpiece.

5. firmware update: why it's important for the left earbud

Many users are unaware that Xiaomi’s headphone firmware is updated separately from the phone. If the left earphone is buggy, the first thing to do is check the relevance of the software.

• 🔊 Dissynchronization of sound (delays up to 0.5 seconds).
• 🔋 Accelerated discharge of one of the headphones.
• 🎵 Distortion of sound at high frequencies.

How to update firmware:

1. Install the Mi Home app (or Xiaomi Wear for new models).
2. Connect the headphones to the phone via Bluetooth.
3. In the application, select your headphones → Device settings → Firmware update.
4. If the update is available, follow the instructions on the screen. Don't turn off the headphones during the process!

In models Xiaomi AirDots 3 Pro and Buds 3T Pro after upgrading to version 4.7.1+, the function "Dynamic Role Distribution" appeared, which automatically assigns the lead earphone. If after the update the left earphone stopped working - reset (see section 3) and wait 5 minutes: the system itself will determine the optimal configuration.

⚠️ Warning: If the headphones are interrupted during the firmware update (for example, the phone runs out), they may stop turning on completely.

6.A charge case check: why the left earphone isn't charging

If the left earphone doesn’t charge in the case or discharges too quickly, the problem may be:

• 🔌 Contaminated contacts (dust, sweat, oxidation).
• 🔋 Faulty battery case (blown, loss of capacity).
• ⚡ Damaged cable or power supply (inadequate current for charging).

How to check:

1. Look at the contacts on the case and earpiece, they should be clean and not bent. Clean them with a cotton swab dipped in alcohol.
2. Try charging the case with another cable and power supply (preferably original on 5V/1A).
3. Put only the left earphone in the case for 30 minutes, and if the indicator does not blink, the problem is in the contacts or the headphone battery.

In Xiaomi Buds 4 Pro and FlipBuds Pro, the case supports wireless charging. If the headphones are not charged from a Qi station, but are charged from a cable, the problem is in the case wireless charging module.

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If the left earphone doesn't charge after cleaning the contacts, and the case shows 100% charge, the battery inside the earphone is likely to be faulty, and only replacing the battery at the service center will help.

7. Alternative methods: if nothing helps

If the standard methods didn’t work, try these non-obvious solutions:

• 📱 Change your transmitter device: connect your headphones to another phone, tablet or PC. Sometimes the problem lies in the Bluetooth module of your main gadget.
• 🔊 Turn off the Absolute Volume feature in the Android developer settings (if enabled.
• 🔄 Use the nRF Connect app (for Android) to manually connect to each earpiece individually and check their status.
• 🛠️ Disassemble the case (only if you are confident in your skills!) and check if the plume going to the contacts of the left earphone has disconnected.

For Xiaomi AirDots Pro 2 and older, there is a hidden engineering menu that allows you to test each headphone separately.

1. Connect the headphones to the phone.


2.In the Mi Home app, quickly tap the firmware version 5 times.




3. The diagnostic menu will open, where you can check:




- Charge level of each headphone




- Bluetooth connection status




-Mic quality

FAQ: Frequent questions about Xiaomi's left-hand headphone