The situation when Xiaomi, Redmi or QCY wireless headphones stop working in pairs is familiar to many users. Instead of the usual stereo sound, you hear music in only one ear, or the right and left channels play different tracks independently from each other, a phenomenon often called desynchronization, and it can occur after prolonged downtime, and as a result of software failures of the smartphone operating system.
The reasons for this behavior are many: from the banal discharge of one of the modules to conflicts of Bluetooth profiles in the Android operating system. Dissynchronization of channels does not always mean physical failure of the device. In most cases, the problem lies in the software that requires a forced restart or a complete reset to factory settings.
In this guide, we will go into detail on the algorithms to restore the accessory to normal operation. You will learn how to properly reset, clear the cache of Bluetooth connections, and understand when you need to interfere with hidden system settings. Recovery of the stereo pair is a process that requires consistency, but is quite accessible even for an inexperienced user.
The main reasons for the dissynchronization of TWS headsets
Before you start to act, you need to understand the nature of the malfunction. TWS (True Wireless Stereo) wireless headphones are technically more complicated than you might think. One of the headphones (master) takes the signal from the smartphone and transmits it to the second (slave), if the communication between them is broken, the effect of working separately.
Often the problem is that if one headphone was more depleted than the other, it could shut down when the other one was still running, causing the connection profiles to become unsynchronized, and interference from other Wi-Fi routers or microwave ovens operating at 2.4 GHz.
⚠️ Attention: Frequently connecting to many different devices without first turning off can overflow the internal memory of the headphone module, which will lead to incorrect pairing mode operation.
Another common reason is to update the smartphone operating system: After an Android or iOS update, the old connection protocols may conflict with new Bluetooth drivers, in which case a failure of codecs or A2DP profiles causes the audio stream to be stratified.
Basic reboot and cleanup of the pairing list
The first step, and often the most effective, is a full reconnect cycle, so you don't have to just turn off Bluetooth in the notification curtain. → Bluetooth and find your device in the list.
Click on the gear or arrow icon next to the headphone name and select the option “Forget the device” or “Unpair the pairing.” This action will completely remove the encryption keys and profiles stored in the phone’s memory. After that, put both earphones in the charging case and close the lid for 10-15 seconds.
- 🔄 Make sure there is a charge left in the case, otherwise the headphones will not turn on for re-synchronization.
- 📱 Reboot your smartphone to reset the operating system’s Bluetooth protocol stack.
- 🎧 Remove the headphones at the same time so they can find each other before connecting to the phone.
If you search again, two identical names appear on the list of devices (for example, “Mi True Wireless EBs Basic” and “Mi True Wireless EBs”). Basic_R»), So the headphones can't see each other, so you just have to connect to one of them, ignore the other, and then you have to start internal synchronization.
☑️ Primary reset algorithm
Hard Reset Methods for Different Models
When software methods don't work, hardware reset is required. The procedure differs depending on the model and the physical buttons on the case. For models without buttons (control through touch zones), the algorithm usually involves prolonged retention of touch panels.
For the popular Mi True Wireless Earbuds series, you need to remove the headphones from the case. Then simultaneously touch the touch areas on both headphones and hold for about 5-7 seconds until the indicator flashes. In some models, such as AirDots, you need to press 5 times quickly or hold 20 seconds.
| Model headphones | Action for discharge | Indication of success |
|---|---|---|
| Xiaomi AirDots 1/2 | 5 quick presses or 20 seconds of hold | Triple flashing red |
| Mi True Wireless 2/2S | Holding the touch zone 7-10 seconds | The indicator flashes white |
| Redmi Buds 3/4 | Holding zones 10-15 seconds in the case | Orange blinking inside |
| QCY T1/T5/T13 | 4 presses or hold 5 seconds | Red-blue flashing |
It's important to do things quickly and synchronously, and if one earphone goes into standby mode before the other, you can't pair it up, and in rare cases, you have to drop each earphone individually, and then you have to delete it from the memory of the phone.
What to do if the indicator does not flash?
Developer and codec settings Bluetooth
For advanced users who own Android smartphones, hidden settings are available that can solve the incompatibility problem. To log into the developer menu, you need to click 7 times on the build number in the About Phone section.
In the Developer Menu, find the Bluetooth section, where you can try changing the protocol version or turning off absolute volume, and sometimes the conflict between AptX and SBC codecs leads to channel desynchronization.
- 🛠 Find the item "Bluetooth version" AVRCP» Try to switch to 1.4 or 1.5.
- 🔊 Turn off the option of "Absolute Volume" if the sound is quieter than usual or interrupted.
- 📡 Turn on the audio codec. SBC», If more complex codecs are used that cause errors.
Changing these settings requires a smartphone reboot, an action that is data-safe, but can temporarily degrade sound quality until the optimal configuration for your particular pair of headphones is matched.
💡
Before changing the developer settings, write down the initial values of the parameters so that you can return everything as it was in the event of deterioration of other Bluetooth devices.
Diagnostics through engineering menus and applications
If standard methods are powerless, you can use specialized software. Applications like Assistant for AirDots or Mi Buds Mimi (for MIUI) allow you to see the charge of each earphone separately and force you to initiate a reconnection.
The Android engineering menu (call code ##6484## or similar for your model) has Bluetooth tests, and you run the test and you can see if the phone module sees both channels on the headset, which helps you understand at what level the failure occurred: on the transmitter or receiver side.
⚠️ Warning: Entering the engineering menu and changing unknown parameters can lead to unstable operation of the smartphone radio module.
It's also worth checking if the phone has a "sound enhancement" app or third-party equalizers, which can intercept the audio stream and misallocate it across channels, creating the illusion of a headphone breakdown.
Checking the battery and physical defects
Physical wear and tear cannot be ruled out: Lithium polymer batteries in miniature headphones degrade over time. If one earphone discharges in 30 minutes and the second one runs for 3 hours, the system can automatically turn off the first one, tearing the stereo pair.
Check the charging contacts in the case and on the headphones themselves. Oxidation or plaque of earwax prevents normal charging. It is better to clean with a cotton swab, slightly soaked in isopropyl alcohol, after removing the headphones from the case.
A critical sign of hardware failure is when the headphones only work separately when connected to a particular phone, but function normally with other devices, indicating a conflict of Bluetooth versions.
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If none of the software methods, including a full reset and flashing through the app, helped, there is likely a physical malfunction of the Bluetooth antenna or power controller inside the earphone.