Owners of budget acoustics from Xiaomi often face a situation when devices stop working in pair mode. Instead of stereo sound, the user hears music from only one earphone, and the second is silent or plays a mono signal. This is due to the desynchronization of the right and left modules, which turns into quality. TWS-headphones in a regular headset.
The problem is solved by forced pairing, which requires precise sequences. If you ignore certain steps, the gadgets may not “see” each other, and you will have to repeat the procedure again. In this article, we will discuss in detail the algorithms for all versions of Mi True Wireless Earbuds, including popular models Basic, S and Pro.
Modern wireless solutions rely on complex communication protocols that sometimes fail when you upgrade your smartphone operating system or discharge your battery. Understanding how Bluetooth modules work will help you avoid future errors. Let's figure out why desynchronization occurs and how to return your devices to factory health.
Reasons for the desynchronization of wireless headphones
The main reason for the loss of communication between the right and left earphones is the inappropriate order of their turn on. Bluetooth protocol assumes that one of the modules (usually the right) acts as a wizard transmitting a signal to the second, if both devices try to find the phone at the same time, they do not have time to connect with each other.
Often the problem lies in the contamination of the contact areas inside the charging case, the oxidation of contacts leads to the fact that one of the headphones does not charge fully and goes into deep sleep ahead of time, when removed from the case, it simply does not have time to activate the radio module to communicate with the “brother”.
⚠️ Note: If you haven't used headphones for a long time, the lithium polymer battery could run out of power. 30-40 minutes, even if the lights do not burn immediately.
Another factor is software failures of the smartphone itself. cached data about old connections can conflict with the current communication session. Before starting the synchronization procedure, it is strongly recommended to clear the list of conjugated devices in the phone settings to avoid address confusion.
Preparation for the synchronization procedure
Before you start active, you need to provide a stable environment for the connection. Make sure that Bluetooth on the smartphone is on, but the device itself is not trying to automatically connect to the headphones. It is better to temporarily turn off the wireless network in the phone settings.
It's critical to check the battery power. If one of the headphones has a power level below 20 percent, the pairing process can be interrupted halfway through, put both modules in the case, and wait until the lights show full charge or at least a stubble glow.
☑️ Pre-reset check
Cleaning contacts is a simple but often ignored step: Use a dry cotton swab or microfiber to wipe the metal pads on the bottom of the headphones and pins inside the case. Fat marks from the ears create an insulating film that prevents charging.
Make sure there are no other active Bluetooth devices nearby that can intercept the signal.Frequency interference from Wi-Fi routers or microwave ovens can also prevent successful pairing, so it's best to set up in another room.
Algorithm of full reset (Hard Reset)
The most effective way to get the headphones to forget old bugs and find each other is to perform a hard reset, which returns the devices to factory settings, erasing the history of all previous connections from the internal memory of the modules.
To perform the reset, remove both earbuds from the charge case. Make sure they are off (indicators do not burn).If they turn on automatically when retrieved, press and hold the touchpads on both headphones simultaneously for 5-7 seconds until the indicators go out.
Now that the devices are off, press and hold the touchpads on both headphones simultaneously. 20-30 The key is to wait until the lights flash red several times in a row, and it's a signal that the reset has been successfully passed.
- 🔴 The indicator flashes red. 3-5 once - discharge completed.
- 🔵 The indicator lights up white / blue - the headphone is switched on.
- ⚪ The indicator does not respond - the battery is discharged or contacts are contaminated.
- 🟣 Blinking purple - there is a process of pairing between headphones.
After a successful reset, put the headphones back in the case and close the lid. Let them lie there for 10-15 seconds to stabilize charging, which initiates a primary handshake connection between the left and right modules inside the enclosed space of the case.
What to do if the color red does not appear?
The process of primary pairing between headphones
Once reset, the most important step is to create a new pair: remove both earbuds from the case at the same time. Don't touch them with your fingers for a few seconds to give the modules time to exchange signals. Ideally, one of them (usually the right one) should flash quickly, and the other should flash less often or burn with even light.
If you see the lights flashing at different frequencies or colors, they're not synchronized yet, so put them back in the case, close the lid, wait 5 seconds and re-extract. Sometimes it takes 2-3 case headphone cycles to establish a stable bridge.
When synchronization with each other is successful, one of the headphones will stop blinking actively, going to the standby mode of connection, while the second will continue to display the search, at which point you need to turn on Bluetooth on the smartphone.
The phone should have a model name on the list of available devices, such as the Mi True Wireless Earbuds Basic. Note that if you see two identical names on the list, then the sync failed and the headphones work independently of each other.
Click on the name on the phone list, and the successful connection will be confirmed by a voice message "Connected" or a characteristic beep, and then you can check the stereo balance by turning on the music — the sound must come from both channels.
Synchronization features of different Xiaomi models
Different generations of headphones have their own nuances in sensor and display control. Older models like the Airdots 1 often require longer button retention to enter reset mode. Newer versions, including the Airdots 2 and Redmi Buds, may have faster reactions.
Wireless charging models (the S or Pro versions) sometimes block touch control while on the charging base, which protects against accidental tapping, but can be confusing when trying to reset without removing the headphones from the case (although it is not recommended to do so).
| Model | Duration of discharge | Indication of success | Type of management |
|---|---|---|---|
| Airdots Basic | 20-25 seconds | Triple red flashing | Touch-sensitive |
| Airdots S | 15-20 seconds | Fast flashing white | Touch-sensitive |
| Airdots Pro | 10 seconds (in case) | Orange case indicator | Sensor + leg |
| Redmi Buds 3 | 10 seconds (in case) | Blinking the case indicator | Touch-sensitive |
For Pro and higher models, a button is often used on the case itself to force pairing. If there is a small indentation on the back or inside of the case, try pressing the clip for 5 seconds with the lid open, which will put the case into search mode, forcing the synchronization of the headphones inside.
Diagnostics and troubleshooting
If after all the manipulations, one earphone still does not work, the problem can be deeper. Check if the device is stuck in mono-sound mode. Go to the special features settings of your smartphone (Special features → Hearing) and make sure that the Mono-audio function is turned off.
Sometimes forgetting the device helps. In the Bluetooth menu, find your headphones, click on the gear or the "i" icon, and select "Forget the device" or "Cancel pairing." Then repeat the reset and reconnect procedure, which will clear the cache of A2DP and HSP profiles.
⚠️ Warning: Don't try to sync your headphones while your phone is connected to them. First, follow all the steps to reset and pair with each other with your Bluetooth off on your smartphone, and then look for the device.
In rare cases, a firmware update is required if the model supports this feature through the Mi Wear or Xiaomi Earbuds app.Old firmware may contain bugs that interfere with stable connection between modules.
💡
If there is only one earphone in the phone, but the music is playing stereo, the problem is not sync, but in the HFP profile. Try in the Bluetooth settings to disable the headset or phone sound profile, leaving only Media Audio.
Balance check is also important. Some music players or systems (e.g. MIUI) have a separate left-right channel balance slider, so make sure it's set straight in the center, or it may seem like one earphone isn't working.
💡
90% of desynchronization problems are solved by completely resetting (holding the buttons until red flashing) and re-extracting both headphones from the case at the same time.