Why headphones work one at a time: the solution for Xiaomi Redmi

The situation of only one of a pair of Xiaomi Redmi wireless headphones is familiar to many users. It is an annoying problem that makes listening to music or talking on the phone a real stress, usually the culprit is a software glitch that causes the left and right channels to stop synchronizing with each other.

In most cases, the device is not physically broken, but simply “forgot” that it should work in pairs. Bluetooth modules inside the case and the headphones themselves require periodic reboot of the connection logic. In this article, we will discuss in detail all possible causes of desynchronization and provide a step-by-step algorithm for restoring the health of your headset.

Before you bring your gadget to the service center, you should try a number of software methods that in 90% of cases return full stereo sound. A critical success factor is a strict sequence of actions when resetting. Don't miss a single step, since sensor press timings often play a crucial role in the reconnection process.

The main reasons for dissynchronization TWS-headset

Understanding the nature of the problem is half the solution. Wireless headphones, or True Wireless Stereo, are a complex system where each module is an independent receiver. When they work alone, it means that communication between the headphones themselves (Master-Slave or TWS Link) is disrupted, although communication with the phone may persist.

A common cause is that one module is faster than the other, and if you take the headphones out of the case, and one of them is 10 percent charged and the other 90 percent charged, the system could go into emergency mode, and there are also extraneous Bluetooth devices in range that are trying to intercept the connection.

• 🔋 Uneven charge of batteries inside the case leads to the disconnection of one of the channels.
• 📡 Software failure of the connection protocol after updating the smartphone operating system.
• 🧊 Getting moisture or oxidation of contacts, because of which the headphone in the case is not charged and not turned on.

Sometimes the problem lies with the smartphone itself. The cache of Bluetooth services may overflow or contain erroneous data about previous connections, in which case even a properly functioning Xiaomi Redmi Buds headset will behave incorrectly. It is important to exclude the influence of third-party applications that can monopolize the audio stream.

Basic reboot and reconnection

The simplest and most often ignored method is the full shut-off and turn-on cycle, with many users simply putting their headphones in the case, thinking they're off, but the indicators can burn, signaling that the device is in standby or search mode.

To start, ignore the device completely in your phone settings. Go to Settings → Bluetooth, find your model (like Redmi Buds 3 Lite) in the list, and click “Forget the device” or “Unpair” to remove the encryption keys from your phone’s memory.

Then put both earphones in the charge case and close the lid. 10-15 Then take them out at the same time. If the LEDs flash blue or white, but only on one device, that means the sync process didn't go through. Try to keep your phone away so that the headphones look for each other instead of your phone.

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When extracting from the case, try to take headphones at the same time for both cases to activate the sensors of inclusion synchronously.

If you search the phone again and you see two identical device names (like two "Mi True Wireless EBs Basic"), it means that the headphones are not connected, and everyone thinks they're in charge, and then you need a hard reset procedure.

Complete Reset (Hard Reset)

Hard reset is a universal cure for most problems with TWS-This process brings back the factory settings of the Bluetooth module and forces the headphones to re-discover each other, and the technique may vary slightly depending on the model, but the general principle is the same.

Put both earbuds in the case and make sure they sit tightly in the sockets (the indicators should catch fire). Leave the lid open. Find the function button on the case (usually hidden inside or behind). If the button is not, the reset is done by touching the touch areas.

For models with a button: press the button for 10-15 seconds until the indicator flashes red or orange several times. For models without a button (for example, Redmi Buds 3 Pro): simultaneously touch the touch areas on both headphones and hold for 10-20 seconds until the indicators blink.

After a successful reset, the headphones will go into pair-finding mode. At that point, don't connect to them immediately. Give them 5-10 seconds to "talk" to each other. Usually, after a reset, one earphone flashes quickly, and the second one flashes slowly until it establishes a connection, after which only one (or both in a certain rhythm) will blink.

⚠️ Note: During the reset procedure, do not bring your headphones close to other previously paired devices. They can automatically connect to your old phone and de-synchronize again.

Bluetooth settings in Android and iOS

The problem may not be the headphones, but how the smartphone handles audio streams. There are hidden developer settings in the Android operating system that can affect codecs and channel allocation, and checking these parameters often helps if the headphones work one after an OS update.

Go to Settings → About Phone and 7 times click on MIUI Version or Build Number to activate the Developer Menu. Then go to Advanced Settings → Developer For Devices. Find “Disable Absolute Volume” and try to change the condition (on or off).

There's also the option on this menu called Bluetooth Mode. If you have a choice of codecs (SBC, AAC, aptX), try to force SBC to be set. This codec is the basic and most stable, although not the best quality, and if you switch it, the sound will appear in both headphones, then the problem was that the codecs were incompatible.

For iOS users, the situation is easier, but there is a nuance with automatic switching. If you use Xiaomi with an iPhone, make sure that the Bluetooth settings do not tick the "Automatically switch to this device" box. This can cause the sound to go to the phone speaker or the second headphone.

Cleaning contacts and checking physical condition

Often the reason is trivial: the earphone just doesn't charge in the case. Sweat glands, earwax and dust create a plaque on the contacts that conducts current worse than it should, and as a result, while you listen to music, one earphone discharges and turns off, and the second continues to work.

Carefully examine the gold contacts on the headphones themselves and the pins inside the case. Even if they appear clean visually, they may have an invisible oxide film on them. Use a cotton swab lightly soaked in isopropyl alcohol or a special contact cleaner to clean them.

Gently wipe the contacts, removing the contaminants. Don't use water or aggressive chemicals. After cleaning, insert the headphones into the case and check if the charging indicators are on fire. If one of the indicators doesn't light up even after cleaning, the mechanical pressing may be the problem.

• 🧹 Use a dry toothbrush to remove pile from the depth of the case charging holes.
• 🔍 Check if one of the headphones falls deeper than the other into the nest.
• ⚡ Try charging the case from another cable and power supply, eliminating energy problems.

⚠️ Warning: Never use metal objects (needles, pins) to clean the contacts inside the case.

Specifics of the Xiaomi Earbuds application

For deep diagnostics and updates of the firmware headphones Xiaomi and Redmi, there is a proprietary application Xiaomi Earbuds (formerly Mi True Wireless), which allows you to see the real charge of each headphone individually and update their internal software.

Install an app from Google Play or the App Store. Connect your headphones to your phone. If you see one headphone on the app showing 0% or "Not Connected," show the other one working, it confirms the software out-of-synchron. The app often prompts you to update the firmware, which can fix bugs.

You can also find headphone search or additional calibration in the app settings. Sometimes reassigning touch button functions through the app helps wake the sleeping module. Try changing the double tap and then returning it back.

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Using the official app is the only way to update the headphone firmware, which often solves compatibility problems with new versions of Android.

When repairs or replacements are required

If none of the software methods, cleaning the contacts and completely resetting them, there's a hardware malfunction, most often the battery of one of the modules or the Bluetooth chip itself fails. In True Wireless systems, battery wear can be uneven.

Symptoms of hardware failure: the earphone only works while it's in the case, but it shuts down immediately after it's removed, or it warms up in the speaker area when it tries to turn on, and in such cases, software repair is powerless.

If the warranty is still valid, contact an authorized service center. TWS-It's very complicated because of the tinyness and the glue of the case, and it's easier and more reliable to replace the device under warranty or buy a new one.