The situation when Xiaomi wireless headphones stop working as a single stereo system and begin to play sound in turn or connect to the phone as two different devices, is familiar to many owners. TWS-This phenomenon, often called out-of-synchronization, can happen suddenly: you take a gadget out of a case, and instead of hearing the usual sound, you hear music on one side only, or you see two identical names on the Bluetooth list.
The main reason is the loss of communication between the left and right earbud. In normal mode, one of the modules (master device) connects to the smartphone and broadcasts the signal to the second (sleev device). When this channel is broken, each device begins to behave independently. This does not necessarily mean a breakage, most often requires forced soldering of the software connection between the speakers.
Don't panic ahead of time, as 90% of the time is solved by software reset, but ignoring the primary signs of desynchronization can lead to more serious problems calibrating sound. In this article, we'll take a closer look at True Wireless Stereo's mechanics and provide a step-by-step algorithm to restore the normal operation of your Mi True Wireless Earbuds.
Technical reasons for desynchronization TWS-headphone
To understand why the failure occurs, you need to look at the connection architecture. Most Xiaomi models, like Redmi Buds or Mi AirDots, use a protocol where the headphone (usually the right one) takes over as a gateway, takes the audio stream over Bluetooth and redirects it to the second channel. If this bridge collapses, the effect is when the headphones are connected separately.
A common cause is a software glitch in the memory of a Bluetooth module. When switching between devices or with a weak battery charge, the module can “forget” who is the master, and both headphones try to initiate a connection to the smartphone independently of each other, and the culprit can also be an interference in the air, interrupting a critical data packet at launch.
⚠️ Warning: If one earbud is discharged more than the other (e.g., a difference of more than 20%), the priority system may not start correctly. Always check that both earbuds are charged before trying synchronization.
In addition, you should take into account the physical factor of oxidation of contacts. If you rarely wipe the case and the headphones themselves, the contact pins form a plaque that prevents the full charging and transmission of service synchronization signals, which often go in parallel with charging at the time of placement in the case.
- 📉 Breaking the connection: Out of range or shielding the signal by the user's body.
- 🔋 Uneven charge: One earphone discharged to zero and went into deep sleep while the second was still working.
- 📡 Interference: Having a large number of running Wi-Fi routers or other Bluetooth devices in the immediate vicinity.
Program reset: a universal method of solution
The most effective way to get the left and right earbuds to see each other again is to perform a full Hard Reset, which clears the modules’ internal memory of temporary files and forcibly puts them into pair-search mode. The algorithm may differ slightly from one model to another, but the basic principle is the same.
Before starting the procedure, be sure to remove the device from the list of paired devices on your smartphone. Find the name of your Xiaomi Earbuds in the Bluetooth settings, click on the gear icon or arrow and select "Forget the device" or "Cancel pairing." This is a critical step, without which further action may be useless.
☑️ Checklist before reset
Now, to the reset mechanics themselves. Put both earbuds in the charge case and leave the lid open. Find the function button on the case case (if you have one), or use the touch zones on the headphones themselves. In case-free models like the early Mi AirDots, you need to simultaneously pinch the touch areas on both earbuds while in the case or pulling them out, and hold for about 15-20 seconds until the display changes.
The reset indicator usually flashes red several times and then flashes white or green frequently to signal readiness. Then turn on Bluetooth on your phone and search. If the procedure is successful, you'll see only one device on the list, not two.
Synchronization Features for Different Xiaomi Series
Xiaomi’s audio lineup is extensive and has different methods of pairing management. Understanding your model will help avoid errors. For example, the Redmi Buds 3/4 Pro series often uses long-term pressing of the case button, whereas the budget AirDots S requires a complex combination of touches.
Owners of active noise cancellation (ANC) models should be careful: when resetting the settings, the calibrations of the microphones may be confused. After restoring the connection, it is recommended to reconfigure the noise emitter level through the Xiaomi Earbuds or Mi Home app, if the model supports such integration.
Below is a table that helps identify the reset method for popular models:
| Model headphones | Resetting method | Indication of success |
|---|---|---|
| Mi True Wireless Earbuds Basic 2 | Hold both sensors for 15 seconds (outside the case) | Triple flashing red |
| Redmi Buds 3 Pro | Press the button on the case 10 seconds | White indicator flashing |
| Mi AirDots 3 | Clutch the sensors 5 seconds before turning off, then 15 seconds | Fast flashing white |
| Xiaomi FlipBuds Pro | Case button 2 seconds | Orange blinking |
If your model is not listed, refer to the instructions on the official website, as the logic of the firmware can be updated by the manufacturer. The main rule is to experiment with the duration of the pressing, if the standard 5-10 seconds do not work.
Problems with the Bluetooth module of the smartphone
Sometimes the culprit in a situation where the headphones work separately is not the headset, but the receiving device. Xiaomi smartphones running on the shell of MIUI or HyperOS have an aggressive energy saving system that can incorrectly handle the A2DP profile when switching between applications.
Try resetting the network settings on the phone itself.This action will delete all stored Wi-Fi passwords and Bluetooth connections, but often eliminates deep conflicts of the Bluetooth stack.The path to the feature usually lies through the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
It’s also worth checking if the “Absolute Volume” mode is included in the developer menu, which sometimes conflicts with the aptX or LDAC codecs used in top Xiaomi models, causing audio stream desynchronization, which can stabilize the connection.
⚠️ Attention: The Developer Menu is hidden by default, and to open it, you need to quickly click 7 times on the build number in the About Phone section.
Another factor could be a crowded Bluetooth cache. Cleaning the cache of the Bluetooth system application through the application management menu (Settings → Apps → Show Everything → Bluetooth → Memory → Clean) helps in cases where the list of associated devices “hangs” software.
The impact of firmware and firmware updates
Electronics manufacturers regularly release firmware updates for their devices, correcting connection stability errors. TWS-headphones constantly lose synchronization, perhaps in their current version of the software there is a known bug.
To check for updates, use the official Xiaomi Earbuds app (available on Google Play and the App Store). Connect your headphones, open the app and click on the headset image. If an update is available, the system will prompt you to install it. It is important to keep the case next to your phone at this point and not open the lid.
The update often optimizes the switching algorithms between the master and the plume, improving the stability of the connection in the noisy ether. After installing the new version, it is recommended to re-perform the reset procedure described in the second section so that the new settings are applied correctly.
It is worth noting that for some older models, such as the first versions of the Mi AirDots, support for updates has already been discontinued, in which case software methods can be exhausted, and the problem may lie in the physical wear of the battery.
Physical malfunctions and battery wear
If none of the software methods worked, and the headphones are connected separately even after reset, there is a high probability of a hardware problem, the most common cause is the degradation of the lithium polymer battery in one of the headphones.
When the battery in one of the ears loses capacity, the voltage drops faster than the critical point. The earpiece turns off or goes into deep sleep while the second one is still running. When placed in a case, the weak battery can charge faster or, conversely, not take charge due to a violation of the cell's chemistry, which confuses the logic of the power controller.
- 🔋 Battery bloating: If the earphone is not sitting well in the case or the case cover is raised in this place, the battery is swelling.
- 💧 Moisture: Sweat or rain could oxidize the board. Even if the device is working, corrosion of the contacts can disrupt synchronization signals.
- 🔌 Case malfunction: Sometimes the problem is not in the headphones, but in the contacts of the case itself, which cannot transfer the command to synchronize.
In cases of physical damage, such as falling from a height, the antenna plume inside the enclosure could have drifted away. TWS-The headphones are extremely complex because of their miniaturization and the adhesive connection of the cases.
Prevention and proper operation
To avoid future situations where left and right earphones are no longer friends, follow simple rules of use. First of all, always try to put the headphones in the case immediately after use, even if you plan to wear them in 5 minutes, this keeps them in standby mode and balances the charge.
Rub your contacts regularly with an alcohol napkin. Dirt and earwax are the main enemies of electrical contact. Clean contacts ensure that when placed in a case, the headphones receive a signal to start charging and synchronizing.
Don't let the device go to zero for a long time. If you don't plan on using it for a month or more, charge it to zero. 60-70% And take it out of the case, store it in a dry place. TWS-headset.