When two devices are removed from the box and only one is working, it often confuses the owner. This is a common problem with True Wireless Stereo headsets, which is not always indicative of a breakdown, most often the failure occurs in the software synchronization channel between the left and right modules.
Owners of Xiaomi, Redmi and Realme have experienced this regularly, and the device may have lost touch with the phone or stopped hearing its stereo partner, and in this article we will examine in detail the recovery algorithms and hard reboot methods.
Don't panic too early. 90 percent of the time, the problem is solved by software without going to the service center, and the key is to get the right sequence of actions when you reset your Bluetooth modules.
Causes of stereo pair dissynchronization
The main reason is the violation of the communication protocol between the channels. TWS-Headsets use complex logic, where one device acts as a master and the second as a slave. If the master mode switched to the phone instead of the second headphone, the sound will only go one way.
Often the culprit is a discharged battery in one of the ear inserts, the protection system can block the operation of the discharged module, even if it is in the case, and also affects the oxidation of contacts on charging pinopes inside the docking station.
⚠️ Note: If one of the modules is discharged to zero, the system may not see it when trying to reset.
External factors, such as interference from Wi-Fi routers or microwave ovens, also affect the Bluetooth signal, which operates at 2.4 GHz, which is often congested in apartment buildings, causing data packet loss and out-of-synchrone.
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Leave the headphones in the case with the lid open for 15-20 minutes to align the charge of the cells before resetting.
Diagnostics of charge state and contacts
The first step is always visual and technical, and mud or earwax on your contacts is a common but common cause of failure, and wipe your metal contacts with a dry cotton wool disc or an alcohol wipe.
Check the indication. When extracted from the case, the LEDs should flash a certain way, indicating status. If one indicator does not light up, the problem may be in the case itself or deep battery discharge.
- 🔋 Check whether the magnets in the case fit tightly to the headphone case.
- 🧹 Clean the speaker grid of dust that can block proximity sensors.
- 🔌 Use the original cable to charge the case to eliminate the shortage of current.
Sometimes, a charge push helps, put the devices in a case, plug it into a powerful power supply (not from a USB port on your computer), and leave it for an hour, which can resuscitate the power controller.
Complete Reset (Hard Reset)
The most effective method is to completely reset, which causes devices to forget old pairings and re-find each other. The algorithm may differ slightly from one Xiaomi model to another, but the base is the same.
First, remove the device from the Bluetooth list on your smartphone. Click "Forget this device" or the gear icon next to the headset name. Only then proceed to a physical reset.
☑️ Reset algorithm TWS
If there is no physical button on the case, use touch panels. You usually need to touch both headphones at the same time and hold your finger for 5-10 seconds until the indicators flash red or white.
⚠️ Warning: During reset, do not remove the headphones from the case and do not close the cover, otherwise the process will be interrupted, and the settings will not remain.
The Redmi and Mi True Wireless models
The Redmi AirDots and Mi True Wireless Earbuds ranges have their own characteristics, and early versions, such as AirDots 1 and 2, often had a problem when the right earbud was no longer a master, requiring a forced reconnection.
Redmi Buds models often use Mi Home or Xiaomi Earbuds, which is a firmware version, and outdated software is a common cause of instability.
Consider the differences in the behavior of indicators during reset:
| Model | Indication of discharge | Retention time | Feature |
|---|---|---|---|
| Redmi AirDots 1/2 | Red (2 times) | 5-7 seconds | No button on the case. |
| Mi True Wireless 2 | White flashing | 10 seconds. | The button inside the case |
| Redmi Buds 3 | Orange | 10 seconds. | Self-dumping |
| Mi Buds 4 | White flashing | Long press. | Support for LDAC |
If the lights flash independently, the stereo is not packed, repeat the procedure by pulling them out of the case at the same time.
Secret team for Android
Settings of the Android and iOS operating system
The problem may not be in the headset, but in the smartphone. Android sometimes misallocates audio streams. Go to the developer's settings and find "Disable absolute volume." Switching it often solves the problem.
It’s also worth checking the power saving mode. Aggressive settings Xiaomi MIUI or HyperOS can “kill” the background process Bluetooth, considering it an unnecessary energy consumer. Add the application “Bluetooth” or “Mi Buds” to the exceptions.
For iOS users, resetting your network settings is important, and it won't delete your photos or contacts, but it will clear all your stored Wi-Fi passwords and Bluetooth pairings. It's a radical but powerful method.
- 📱 Turn off the audio balance function in the Universal Access settings.
- 🔄 Switch the Bluetooth codec with AAC on SBC developer-setting.
- 🚫 Turn off Mono-Audio mode if it is activated accidentally.
If nothing works, try connecting the headphones to another device, which will allow you to determine exactly where the root of evil lies: in the source of the signal or in the headset itself.
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Changing the device to check is the quickest way to know who is to blame: the phone or headphones.
Software conflicts and firmware updates
Version conflicts are common. If your headphones support an update through the app, be sure to check for a new version.
Sometimes cleaning the cache of Google Play services or the Bluetooth system cache helps. To do this, go to Settings → Apps → Show system → Bluetooth and click Clear Cache.
In rare cases, flashing through special utilities on a PC is required, but for mass Xiaomi models, this is done only by OTA (over the air).
⚠️ Warning: Do not interrupt the firmware update process. If the battery runs down at this point, the headphones can turn into a "brick", the recovery of which is possible only in the service.
Note the background applications. Recorders, equalizer players, or voice chat games can capture the audio channel monopolistically, preventing the system from redistributing the sound to both channels.
When service repairs are needed
If the software methods are powerless, there is probably a hardware malfunction, which could be a Bluetooth module failure, battery degradation, or plume damage.
Symptoms of hardware breakdown: one headphone warms, makes a crack, has much less time to work or does not charge at all (the indicator does not light up even after cleaning the contacts).
Guarantee case
Restore the power chain or replace the battery requires micro soldering, and at home, without a soldering station and a microscope, it is impossible to do this qualitatively, and attempts to repair the device can lead to complete failure.
The cost of repairs is often 50-70% of the price of new headphones, and if the warranty period has expired, it is sometimes easier to buy a new model than to restore the old one.