The situation when the right and left channels of Xiaomi TWS stop working synchronously, familiar to many users of the ecosystem. Instead of volumetric stereo sound, you hear music from only one ear, and the second silent or makes incomprehensible sounds, this phenomenon is often called out-synchronization, and it can occur suddenly, for no apparent reason.
The problem is that the headphones themselves are broken, not just the connection to the smartphone. The Bluetooth protocol TWS (True Wireless Stereo) requires one device (master) to transmit a signal to the second (sleev) before the sound goes to the speakers. If this bridge is broken, the gadgets behave like two independent mono-devices.
Most of the time, it's not a software failure, not a fatal hardware failure, but you can't ignore it, because the constant reconnection attempts quickly land the battery, and let's look at why that happens and how to get the devices back to work in pairs.
The main reasons for dissynchronization TWS-model
The first thing to do is to rule out the trivial but critical factors, and often the contact group on the charging case becomes oxidized or polluted by dust, which means that one of the headphones simply doesn't charge, and if the left or right module is discharged to zero, it won't be able to initiate the pairing process.
Another common cause is a Bluetooth address conflict, where the device could have "remembered" an old smartphone or tablet it was trying to connect to before, and now automatically reaches for it, ignoring the partner, and also crashes after updating the phone's firmware or the headphones themselves when the code is not working properly.
Falls, moisture or extreme temperatures could damage the antenna module inside the enclosure, in which case software methods may be useless and require diagnostics at the service center.
The myth of water resistance
Complete Reset (Hard Reset) procedure
The most effective way to make Xiaomi Redmi Buds or Mi True Wireless make friends again is to perform a hard reset, which clears the internal memory of the devices from all stored profiles and returns them to a factory state.
First, put both earphones in the charge case and make sure they are installed correctly. The indicators should light up, signaling the start of charging. If there are no indicators, wipe the contacts with a dry cloth or cotton swab with alcohol.
Then the algorithm of actions depends on the specific model: on some devices you need to pinch the touch zones on both headphones simultaneously for 10-15 seconds; on others, use a physical button on the case; it is important not to release the buttons until the indicator flashes a certain color (usually red or white).
☑️ Reset algorithm
⚠️ Warning: After resetting, the headphones will forget all previously connected devices. You will have to re-search and pair in the settings of your smartphone or tablet.
Profile removal and re-pairing
Once you've done the reset, it's critical that you do the mating procedure right, because if you just turn on Bluetooth on your phone, it can see two separate devices with the same name, and your job is to connect them together and then to your phone.
Take both earbuds out of the case at the same time. Wait for them to sound ready. At that point, they have to find each other. Only after you hear the characteristic connection sound or the voice message "Connected" can you go to the smartphone.
Go to your mobile device's Bluetooth settings. Find the name of your model (e.g. Mi True Wireless EBs Basic) on the list of available devices. Click on it to connect. If the system asks for confirmation, agree.
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If you have multiple copies of your device left on your Bluetooth list marked "not connected," delete them all. Leave only one active entry to avoid confusion when automatically connecting in the future.
Sometimes this trick helps: after removing the device from the paired list, turn off Bluetooth on the phone, put the headphones in the case, close the lid, wait 10 seconds, and only then start the process again, which allows you to completely reboot the protocol stacks.
Diagnostics of charging case and contacts
Often the problem is not with the headphones themselves, but with the headphones at home. The charge case is a complex electronic device with its own control board, and if one of the channels in the case fails, the headphone does not charge and does not receive a signal to synchronize.
Carefully examine the contacts inside the recesses of the case, which should not be pressed, oxidized or contaminated with pile, and you can use a dry toothbrush or a stick dipped in isopropyl alcohol to clean the contacts before use.
| Symptoms. | Possible cause | Decision |
|---|---|---|
| The indicator is not on. | Case discharged or contaminated contact | Charge the case, clear the contacts. |
| Blinks red. | Charging error or low charge | Replace the cable, check the power supply |
| The headphone falls off the list | Unstable contact in the nest | Fix the headphone in the case, press it. |
| Only one charger. | Case controller malfunction | Requires a replacement case or repair |
Also check the charging cable. Using cheap cables without support for normal current can lead to undercharging of the case, which causes malfunctions in the electronics of the headphones.
Program conflicts and smartphone settings
Sometimes the smartphone itself is the culprit, and an overflowing cache of Bluetooth services on Android or iOS can interfere with new connections, especially for devices that have been in use for years without reinstalling the system.
Try resetting the network settings on your phone. This action will return all network settings (Wi-Fi, Bluetooth, mobile data) to factory values. The path to the option is usually in the Settings menu → System → Settings Reset → Reset settings Wi-Fi, mobile Internet and Bluetooth.
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Resetting your phone’s network settings is a secure operation that won’t delete your photos or contacts, but will force you to re-enter passwords from Wi-Fi networks.
It’s also worth checking if power saving mode is turned on, which aggressively limits the background work of Bluetooth.In some MIUI or HyperOS shells, there are special battery optimizers that can “kill” the connection process.
⚠️ Note: When you reset your network settings on Android, you will lose all saved passwords from Wi-Fi networks. Make sure you remember your home Internet password, or write it down before you perform the operation.
Hardware malfunctions and battery wear
If the software methods didn't help, it might be physical wear and tear. TWS-Headphones are very small and degrade faster than smartphones. 2-3 One of them could just lose the capacity and stop holding the charge.
A sign of hardware failure can be a situation where the headphone is only working while in the case (on the wire), but turns off immediately after removal, and the problem with hardware is indicated by the lack of response to touches or buttons even after full charging.
In rare cases, the antenna inside the case will be knocked off because of an impact, which is visually impossible to determine. If the warranty is still in place, do not try to open the case yourself, this will lead to a loss of warranty obligations.
Can the battery be replaced?
Use of the Xiaomi Earbuds app
Xiaomi and Redmi devices have a special application called Xiaomi Earbuds (or Mi Wear) that not only tracks the charge, but also updates the firmware of the headphones, and often manufacturers release patches that fix connection errors.
Connect your headphones to your phone, launch the app, and check for updates. If the firmware version is outdated, update. In the process, don't turn off your smartphone screen and keep your headphones next to your device.
You can also find headphone search or calibration, and some models allow you to reset your settings directly through the program interface, which sometimes works more efficiently than mechanical buttons.