How to connect the second headphone Xiaomi Air 2: full instructions for synchronization and troubleshooting

Xiaomi Air 2 wireless headphones (also known as Mi Air 2 or Mi True Wireless Earbuds 2) have become popular choice due to the balance of price, sound quality and usability. However, many users face a typical problem: one of the headphones stops working, does not connect to the phone or does not sync with the second, most often after a firmware update, battery discharge or accidental reset.

In this article, we will discuss all possible ways to connect a second headphone, including forced synchronization through a button on the case, resetting to factory settings and checking compatibility with your smartphone. You will also learn how to avoid common mistakes that cause the communication between the headphones to break, and what to do if the problem recurs regularly. LC3-Codec and aptX Adaptive.

Before you start setting up, make sure that both headphones are charged (the indicators on the case are white or green), and your smartphone supports Bluetooth 5.0 or later. If the headphones have previously connected to another device, you will have to “forget” them in the Bluetooth settings before re-syncing.

Why Xiaomi Air 2’s second headphone doesn’t connect: the main reasons

Problems with connecting the second headphone Xiaomi Air 2 is usually due to one of the following reasons:

• 🔋 Battery discharge – even if the case shows charge, one of the headphones may not have contacted the charging contacts.
• 📱 Conflict with Bluetooth devices – headphones can “hang” in the memory of the phone after an incorrect disconnection.
• 🔄 Synchronization failure between headphones – often occurs after updating the firmware or mechanical impact (fall, impact).
• 🛠️ Software firmware failure – especially relevant for models with support for Mi AI Assistant.
• 🎧 Physical damage – getting moisture, clogging charging contacts or microphone.

In 80 percent of cases, the problem is solved by forced resynchronization of the headphones through the case, but if the earphone does not respond to pressing or does not charge at all, this may indicate a hardware malfunction, such as a dump of an antenna module or a damage to the board, in which case repairs will be required at the service center.

⚠️ Note: If the second headphone flashes red when extracted from the case, it signals a critical firmware error. Attempts to reset it through standard methods may fail - in this case, try updating the firmware through the Mi Earphones app (available for Android).

Method 1: Forced synchronization through a button on the case

The most reliable method of reconnecting headphones is to reset the hardware through a button on the back of the case, which resets all Bluetooth settings and forces the headphones to re-find each other.

Follow the following steps:

1. Place both headphones in the case and close the lid.
2. Connect the case to the power source (for example, to charge from a smartphone).
3. Press and hold the button on the back of the case for 15-20 seconds until the indicator starts flashing red and white alternately.
4. Release the button. The indicator should light up white, which means that the headphones are reset and ready for new synchronization.
5. Remove the headphones from the case – they must automatically connect to each other (the indicators on both headphones will flash synchronously).

If the second headphone still doesn’t connect, try removing the device from your phone’s memory:

1. Open the Settings. → Bluetooth on your smartphone.
2. Find Xiaomi Air 2 in the list of associated devices and click “Forget this device”.
3. Return the headphones to the case, then remove them again – they should appear in the list of available devices as Mi True Wireless Earbuds 2.

Both headphones are clean (no dirt on the contacts)

Case charged at least 30%

Headphones are not connected to other devices

Bluetooth on your phone is enabled and visible for all devices-->

Method 2: Reset your settings through the Mi Earphones app

If the hardware reset didn’t work, try using the official Mi Earphones app (available for Android), which not only allows you to adjust the equalizer and gestures, but also update the firmware of the headphones, which often solves connection problems.

Instructions:

1. Download the Mi Earphones app from Google Play.
2. Connect your headphones to your phone (even if only one works).
3. Open the app and wait for it to determine the model (Air 2).
4. Go to the Settings section → Update the firmware.
5. If a new version is available, click "Update." Don't interrupt! The headphones will reboot automatically.
6. After updating, return the headphones to the case, then remove them - they should be synchronized again.

If the application shows the error "Can not connect to the headphones", try:

• 📱 Reboot your smartphone.
• 🔌 Connect the case to another power source (for example, to a PC via a USB).
• 🎧 Remove headphones from Bluetooth memory and reconnect them.

Method 3: Checking compatibility with your device

Sometimes the problems with connecting the second headphone are not due to the Air 2 itself, but to the incompatibility of the Bluetooth module of your smartphone. For example, older iPhone models (before the iPhone 8) or budget Android smartphones with Bluetooth 4.2 may not work correctly with the LE Audio protocol that Xiaomi Air 2 uses.

Check the compatibility on the table:

If your device falls into the category of "Partial Compatibility" or "No", try connecting the headphones to another smartphone or tablet with Bluetooth 5.0. If both headphones work normally, the problem is with your phone, not the Air 2.

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On iPhones with iOS 15 and later, disable Auto Switch between Devices in Bluetooth settings before connecting.

Method 4: Cleaning contacts and checking physical condition

If the second Xiaomi Air 2 headphone doesn’t charge or turn on at all, the problem can be in contaminated contacts or mechanical damage. Dust, sweat or moisture over time oxidize the metal contacts on the headphones and in the case, which leads to poor connection.

How to clean contacts:

1. Remove the headphones from the case and inspect the gold contacts on the bottom (near the magnets).
2. Take a cotton swab soaked in isopropyl alcohol (90%+) or regular vodka and gently wipe the contacts.
3. Dry your headphones for 10-15 minutes (do not use a hair dryer!).
4. Check the contacts inside the case, they may be contaminated, and clean them in the same way.

After cleaning:

• 🔋 Place the headphones in the case and wait until the indicators light up green (full charge).
• 🎵 Remove them and check for sync – if contacts were the cause, the headphones will connect automatically.

⚠️ Warning: If the earphone doesn't charge after cleaning, check the magnets in the case, and they may demagnetize or move over time, which means the earphone doesn't lock in the right charging position, which means you'll need to replace the magnets or the case.

Method 5: Alternative Connection Methods (for Power Users)

If standard methods don’t work, you can try manual reconnection via Bluetooth service commands, which is suitable for Android smartphones with root rights or developer mode enabled.

Instructions for Android:

1. Enable Developer Mode (7 times click on Build Number in your phone settings).
2. Return to Settings → System → Developer Mode and enable Bluetooth Debugging.
3. Connect your headphones to your phone (even if only one works).
4. Install the nRF Connect application.
5. Open the app, find Xiaomi Air 2 in the list of devices and connect.
6. Go to the DFU (Firmware Update) tab and click Select File – download the latest firmware version for Air 2 (can be found on the 4PDA or Xiaomi Community forums).
7. Press Start DFU and wait for the process to be completed.

For iPhones, this method is not suitable due to the limitations of iOS.

• 📱 Reset network settings: Settings → Mainstream → Reset → Reset the network settings.
• 🔄 Reboot your iPhone, then reconnect your headphones.

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If none of the methods worked, the problem is likely to be with the headphone hardware (an antenna, battery or Bluetooth controller) in which case, contact the Xiaomi service center or consider replacing under warranty.

Frequent User Mistakes and How to Avoid Them

Many of the problems with the Xiaomi Air 2 are due to non-obvious usage errors.

• 🔌 Connect to multiple devices at the same time – headphones do not support multipoint (simultaneous connection to your phone and laptop.
• 🔋 Using an unoriginal cable to charge a case can lead to unstable voltage and malfunctions in the Bluetooth controller.
• 🎵 Removing headphones from the case at different times – always pull them out at the same time, otherwise they may not sync.
• 📱 Updating firmware through an unstable Internet connection – an interrupted update often leads to the “bricking” of one of the headphones.

Also avoid:

• 💦 The swelling of the water, despite the IPX4, Headphones are not intended for use in the rain or in the shower.
• 🔥 Overheating – Do not leave the case under direct sunlight or near heat sources.
• 🎧 Storing headphones outside the case - this leads to battery discharge and loss of communication between them.

Critical: If you use Xiaomi Air 2 with Windows devices (laptops, PCs), disable Hands-Free (HFP) profile in Bluetooth settings and leave only A2DP. Otherwise, the headphones will connect in headset mode (monosound), and the second channel will not work.

FAQ: Answers to Frequent Questions