Why are Xiaomi wireless headphones not synchronized and how to fix it?

Xiaomi’s wireless headphones are some of the most popular accessories, thanks to a combination of price, sound quality and functionality. However, even proven models like the Redmi AirDots 3 Pro, Xiaomi Buds 4 or FlipBuds Pro sometimes have problems with synchronization: one earphone does not connect, both do not find the phone, or sound is only in mono mode, and the causes can be due to software failures and hardware malfunctions.

In this article, we’ll look at all the possible causes of Xiaomi headphones not synchronizing, from a simple battery drain to a Bluetooth module that’s damaged. You’ll get step-by-step instructions for each situation, including resetting, firmware updates, and diagnosing hardware problems, and if your model is not recoverable, we’ll give you a guide to avoiding similar problems in the future.

Before you start repairing or bringing your headphones into service, check out the simple solutions -- they work 70 percent of the time. Let's start with the diagnosis!

1. Diagnostics problem: why are headphones not synchronized?

The first step is to determine what kind of failure happened, and Xiaomi headphone synchronization issues fall into three categories:

• 🔴 Headphones don’t connect to your phone – both or one of them don’t appear in the Bluetooth list of devices.
• 🔵 Headphones are connected, but the sound is only in one – the second headphone is silent or emits intermittent signals.
• 🟢 Headphones are not synchronized with each other – each connects separately, stereo mode does not work.

Each of these problems has its own causes, such as if Xiaomi Buds 3T If you don't find a phone, it could be a Bluetooth smartphone or an outdated headphone firmware, and if you only hear it in one Redmi AirDots 2 headphone, you probably have a lost sync setting between the left and right devices.

Before you go into complex manipulations, make sure that the problem is not in the trivial things:

Charge headphones to 100% (the indicator should burn green)

Make sure your phone’s Bluetooth is on and running (try connecting another device)

Reboot your smartphone (sometimes helps with Bluetooth module failures)

Check if power saving mode is on (it may limit Bluetooth operation)-->

2 Headphones are not turned on: what to do?

If Xiaomi headphones don't respond to the on button or the indicators don't light up, the problem is most often power or mechanical damage.

1. Check the charging: 🔌 Connect the headphones to the charger for 30 to 60 minutes. Use the original cable. USB-C Type-C (depending on the model). 🔋 If the light doesn't turn on, try another cable or power supply. Sometimes the problem is a damaged connector. 🔄 For models with a case (for example, Xiaomi Buds 4 Pro) check whether the headphones are properly installed in the sockets - contacts should touch.
2. Reset your headphones: If charging didn’t work, perform a hardware reset. For most Xiaomi models, the algorithm is: 1. Pull your headphones out of the case (if you have them). 2. Press the on button on both headphones for 10-15 seconds. 3. Wait for the red and white lights to flash (reset signal). 4. Place the headphones back in the case and charge.
3. Check for physical damage: 🔍 Inspect the body for cracks or dents – they can damage internal contacts. 💧 If the headphones are in the water (even if they are in the water). IPX4-Models), dry them in rice or silica gel for 24 hours. 🔊 Look, is there a crackling out of the speakers, a sign of short circuit.

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If the headphones Xiaomi Air 2 SE Or Redmi Buds 3 Lite doesn't charge from the case, try cleaning the contacts with a cotton swab dipped in alcohol.

If the headphones never turned on after all the manipulations, the problem could be a damaged battery or a burned-out board, in which case only the service center will help.

3.One earphone is not connected or is not working

The situation when one headphone (usually the right one) connects to the phone and the second one is silent is the most common.

• 🔄 Synchronization failure between left and right earphone (they must connect as a stereo pair).
• 📱 Bluetooth Error on Phone (Especially Important for the Phone) MIUI older than 12th version).
• 🔋 The battery is discharged in one of the headphones (even if the indicator is on).
• 🛠️ Mechanical breakdown of the speaker or antenna (less often).

Solutions for each of the reasons:

Resetting synchronization between headphones

If the headphones are connected separately but do not work together:

1. Get both earphones out of the case.
2. Press the buttons on both headphones for 10 seconds until the red light flashes.
3. Place the headphones back in the case, close the lid and wait 30 seconds.
4. Take them out and try to reconnect them – they should sync automatically.

Update of the headphone firmware

For Xiaomi Buds models 3/4 Pro and FlipBuds Pro are available firmware updates via the Mi Earphones app (formerly Mi Headphones).Outdated firmware often leads to sync failures.

Download the app from Google Play or App Store

Put your headphones on the phone.

Open Mi Earphones → section “Update of the SO"

Follow the instructions on the screen (do not turn off the headphones during the process)-->

If the app doesn't see headphones, try:

• 📱 Reinstall Mi Earphones.
• 🔄 Reboot the phone.
• 🌐 Connect to another Wi-Fi network (sometimes the update is blocked due to geo-restrictions).

Bluetooth check on your phone

Sometimes the problem isn't with the headphones, it's with the smartphone, so to rule out that:

1. Open Settings → Bluetooth.
2. Remove the headphones from the list of associated devices.
3. Reboot the phone.
4. Turn on Device Search mode and try to connect again.

4. Headphones plug in, but only one sound.

If Xiaomi headphones are connected to a phone, but the sound is played in only one (usually the right), the problem is in the audio profile settings or synchronization failure.

Checking the sound profile on the phone

Xiaomi (and some other brands) have a separate setting for mono/stereo mode to change:

1. Open the Settings. → Sound. → Headphone settings.
2. Select the connected headphones.
3. Make sure that Stereo mode is on (not Mono or Left/Right Ear Only).

If there is no such item, try:

• 📱 Reconnect the headphones (remove and add again).
• 🔊 Turn on / off the absolute volume in the developer settings (if available).
• 🎵 Start the music player and manually select the output to the headphones.

Resetting headphone settings via Mi Earphones

Mi Earphones allows you to reset the audio settings to the factory.

1. Open the app and connect the headphones.
2. Go to Settings → Reset settings.
3. Confirm the action and wait for the headphones to restart.

After reset, Xiaomi headphones should automatically sync in stereo mode.

Checking for hardware malfunctions

If the sound is still only in one headphone, physical damage is possible:

• 🔊 Speaker: Try listening to another audio file - if you hear crackling in silence, the speaker is damaged.
• 📡 Bluetooth antenna: If the headphone connects, but there is no sound, the antenna contact may have gone away.
• 🔋 Battery: A discharged earphone can be “silent” even if the indicator is on.

5 Headphones are plugged in but are permanently switched off

If Xiaomi Buds or Redmi AirDots are connected, they lose the connection, the reason may be:

• 📶 Interference from other devices (Wi-Fi routers, microwaves, other Bluetooth gadgets).
• 📱 Energy-saving phone settings (especially relevant for the MIUI).
• 🔄 Outdated firmware headphones or phone.
• 🔋 Weak battery (earphones are turned off at a charge level below 10%).

Decisions:

Power saving power outage for Bluetooth

Xiaomi smartphones have aggressive power saving enabled by default, which can break the connection to the headphones.

1. Open Settings → Battery and Performance → Power management applications.
2. Find Bluetooth in the list and select No Limits.
3. Also disable Adaptive Battery and Optimization MIUI (if).

Changing Bluetooth range

If the headphones are turned off at a distance of more than 5 meters, try:

• 📱 Switch the phone to High Performance Mode (in battery settings).
• 🔄 Disable other Bluetooth devices (fitness bracelets, smart watches).
• 📡 Move closer to the router (sometimes Wi-Fi causes interference).

Update of phone firmware

If the problem occurs after the update MIUI, Check to see if the fix has come out:

1. Open Settings → About the phone → System update.
2. Download and install the latest version of the firmware.
3. After the update, restart the phone and reconnect the headphones.

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If Xiaomi headphones are turned off during calls, check your Bluetooth settings. HD Audio in Mi Earphones. Sometimes codec AAC or aptX is in conflict with the voice connection.

6. Hardware malfunctions: when you need help from the service

If none of the software methods worked, the problem could be a physical breakdown, and here are some signs you should contact the service:

• 🔥 Headphones overheat during charging or work.
• 💧 Liquid intake (even if the model is waterproof, IPX4 It does not save you from salt water or tea).
• 🔊 Crack or lack of sound in one of the headphones with visually working dynamics.
• 🔋 Fast discharge (earphones sit down in 1-2 hours instead of the declared 5-6).
• 📡 Constant communication interruptions even near the phone.

The most frequent hardware breakdowns:

If your Xiaomi headphones are warranty, do not try to disassemble them yourself - this will void warranty obligations.

• 📍 Moscow: 16 Leo Tolstoy St. (at the Afimall shopping center").
• 📍 St. Petersburg: Ligovsky Prospect., 10/118 (at the Gallery").
• 📍 Regions: Addresses can be specified on the website mi.com/ru/service/center.

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Before visiting the service, make a backup copy of the phone data - sometimes a factory reset is required for diagnosis.

7. How to avoid synchronization problems in the future

To make Xiaomi headphones work stably, follow these recommendations:

• 🔋 Charge your headphones correctly: Use the original cable and power supply. Don't leave your headphones on charge for more than 2-3 hours. Store them in a case - this protects against dust and moisture.
• 📱 Update your firmware: Check for updates in Mi Earphones every 1-2 months. Don't interrupt the update process - it can "brick" the headphones.
• 🛡️ Avoid mechanical damage: Do not drop your headphones or press the body. Do not use them during rain or in the pool (even with the help of a squirrel). IPX4).
• 🔄 Reset your settings regularly: Reset your headphones every 3 to 6 months through Mi Earphones. Remove your headphones from your Bluetooth device list if they haven’t been used for a long time.

Also, pay attention to compatibility:

• 📱 Xiaomi headphones work best with smartphones on MIUI (For example, Redmi Note 12, Xiaomi 13).
• 🍎 iPhone may have codec problems AAC — Try switching to SBC customized.
• 🤖 Other Android brands (such as Samsung) sometimes require you to disable Dual Audio (Dual Audio).

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If you often lose connection while jogging, try wearing your phone on your hand (in your bicep case) – this reduces body interference.

FAQ: Frequent questions about synchronizing Xiaomi headphones