How to reflash headphones Xiaomi Air 2S: Official and alternative methods

Xiaomi Air wireless headphones 2S (model TWSJBL04WM) They remain popular with users due to their balanced sound, aptX support, and long battery life, but over time, even such technology can cause software failures, from accidental connection breaks to problems with touch control. In 80% of cases, these problems are solved by firmware reflashing – updating the firmware.

Unlike smartphones, earbud firmware is a more delicate process. A mistake at any stage can lead to a "bricking" of the device when the headset is no longer on or defined by the system. This article covers all the current ways to update for Air. 2S: From the official method via the Mi Fit app to manually upgraded via ADB We'll also look at how to avoid common mistakes and what to do if the firmware is stuck".

Why you may need to reflash Xiaomi Air 2S

The manufacturer regularly releases updates for headphones, but not all users install them, while fresh firmware solves a number of problems:

• 🔊 Sound distortions – wheezing at high frequencies or missing bass, especially noticeable when listening to music via aptX.
• 📶 Unstable connection – headphones disconnect from the phone after 5-10 minutes or do not sync with each other (left / right channel works separately).
• 🔋 Fast battery discharge – the battery goes down in 2-3 hours instead of the declared 5-6, even in standby mode.
• 🎛️ Failing gestures – touch buttons do not respond to touch or are delayed.
• 🔄 Device switching problems – Headphones don’t automatically connect to the last used gadget.

In addition, new firmware versions often add hidden features that Xiaomi does not advertise. For example, in the update from July 2023, there was support for the new software. LC3 (new codec for Bluetooth LE Audio, although officially Air 2S It's not declared. It can also improve compatibility with iOS or fix bugs when working with Windows 11.

⚠️ Note: If your headphones Xiaomi Air 2S If you buy them on AliExpress or in unofficial stores, there is a risk that they are equipped with fake firmware, in which case a standard update may cause them to fail.

Official way: Update via Mi Fit

The safest and most recommended method is to use the proprietary Mi Fit app (or Zepp Life for newer versions), which is suitable for 95% of users and does not require technical skills.

1. Install the latest Mi Fit from Google Play or App Store.The app version must be at least 5.12.0 (check in Settings). → About the programme).
2. Connect your headphones to your smartphone via Bluetooth. Make sure they are defined in Mi Fit as Mi True Wireless Earphones. 2S.
3. Open the device section in the app, then go to Settings → Firmware update.
4. Download the update if available. The file weighs about 2-4 MB, so use a stable Wi-Fi connection.
5. Start the upgrade process. Headphones should be at least 50 percent charged and the case should be 30 percent charged. Don't remove them from the case during the procedure!

It takes 5-10 minutes, the headphones flash white and red, and the app will have a progress bar, and when they are finished, they will automatically restart.

Check out the Mi Fit version (minimum 5.12.0)

Headphone charge ≥50%, case ≥30%

Connect to Wi-Fi (not mobile internet)

Make sure the headphones are connected to the phone via Bluetooth

Close other applications that use Bluetooth (such as games or instant messengers)-->

If the update button in Mi Fit is inactive, it can mean:

• 📱 The headphones have been updated to the latest version.
• 🌍 Your region is not supported (updates are coming first in China, then in Europe).
• 🔌 Connection problems with Xiaomi servers (try later or change network).

Alternative method: manual firmware through ADB

If the official update is not available or you want to install custom firmware (for example, with modified software). EQ), can be used ADB (Android Debug Bridge requires command line experience and is only suitable for Android devices.

Warning: Mishandling your firmware can lead to loss of warranty and headphone failure. Use this method only if you understand the risks!

Step 1: Preparation of tools

• 📱 Smartphone on Android 8.0+ plug-in USB (Settings → For developers → Debugging by USB).
• 🖥️ Computer with installed ADB and Fastboot.
• 🔗 Firmware file in.bin or.zip format (download only from trusted sources, for example, Xiaomi Firmware Updater).
• 🔌 Cable USB-C/USB-A connect phone to PC.

Step 2: The firmware process

1. Connect your smartphone to your PC and authorize debugging USB (Allow access to the window on the phone that appears).
2. Place the firmware file in the folder with ADB (usually C:\platform-tools).
3. Open the command prompt in this folder (click Shift + PCM → Open the PowerShell window here).
4. Enter the commands in order: adb devices (should display your phone serial number) adb push firmware.bin /sdcard/ (substitute firmware.bin Added to the file name adb shell am start -n com.xiaomi.hm.health/com.xiaomi.hm.health.upgrade.UpgradeActivity (This will open the hidden update menu in Mi Fit)
5. In the Mi Fit application, select the firmware file from your phone and confirm the installation.

⚠️ Note: If after the scaling of the ADB The headphones stopped turning on, try resetting them to factory settings. To do this, place them in a case, then quickly press the left and right earphone touchpad three times at the same time (hold 10 seconds.

How to check the current version of the firmware

Before you upgrade, it's helpful to know which firmware is already installed, which will help you determine if you need an update at all, and you can do this in two ways:

Method 1: Through Mi Fit

1. Open the Mi Fit app and go to the section of your headphones.
2. Slip on the gear icon (Settings) → About the programme.
3. Find the firmware version string. It'll be in Vx.x.x.xxx format (e.g., Vx.x.xxx, V1.7.0.123).

Method 2: Through Bluetooth Log (for Android)

If Mi Fit does not display the version, you can use hidden system logs:

1. Install the nRF Connect application.
2. Connect the headphones via Bluetooth.
3. In the application, select Device Information → Software Revision.

Up-to-date firmware versions for Xiaomi Air 2S (as of 2026):

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If your firmware version is older than the one in the table, but the update to Mi Fit is not available, try changing the region of the app. To do this, change the language to English (USA) and the region to China in your phone settings.

Typical Firmware Errors and Their Solutions

Even when following the instructions, users encounter problems, and here are the most common mistakes and ways to fix them:

1. Headphones are not defined in Mi Fit

Reason: Bluetooth connection conflict or an outdated version of the application.

Decision:

• 📱 Remove headphones from the list of conjugated devices in Bluetooth settings.
• 🔄 Restart your phone and headphones (hold the button on your case for 15 seconds).
• 📲 Update Mi Fit to the latest version or reinstall it.
• 🔌 Connect to the headphones via another device (like a tablet), then return to the phone.

2. the update process “hangs” by 0% or 100%

Reason: Unstable Internet connection or battery discharge during firmware.

Decision:

• 🔋 Check the headphone charge (should be) ≥Charge them for 10-15 minutes.
• 📶 Switch from mobile to Wi-Fi or vice versa.
• ⏳ Wait 10-15 minutes – sometimes the process looks “hangy”, but it’s actually in the background.
• 🔄 If more than 20 minutes have passed without changes, remove the headphones from the case, wait for them to turn off and try again.

3. After firmware, the headphones do not turn on

Reason: Interrupted update process or incompatible firmware version.

Decision:

• 🔋 Place the headphones in the case and plug it into charging for 30 minutes.
• 🔄 Reset: Hold the touchpads of both headphones for 15 seconds (indicators should flash red).
• 📱 Try to re-sweeten them through Mi Fit or ADB.
• 🛠️ If nothing helps, contact the Xiaomi service center – you may need to solder memory.

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If the headphones, after a failed firmware, emit an audible signal when placed in a case, but do not turn on, this is a sign of a damaged bootloader. EDL-Regime (special equipment required).

Where to download the original firmware for Xiaomi Air 2S

Xiaomi's official firmware files are not publicly available, but they can be found on specialized resources. Important: Only download firmware from trusted sources to avoid viruses or fake files.

Recommended sites:

• 🌍 Xiaomi Firmware Updater is the largest firmware base for Xiaomi devices, including headphones. Files are checked for integrity.
• 📥 4PDA — Russian-speaking community where users share current versions and instructions.
• 🔗 XDA Developers – an international forum with discussions of custom firmware and modifications.

When downloading, pay attention to:

• 🏷️ Device model – the file should be designed for TWSJBL04WM (Air 2S).
• 🌎 Region - Firmware for China (CN) This may not be the case for the Global Version (Global).
• 📅 Release Date – Older versions (until 2023) may contain vulnerabilities.

⚠️ Note: Firmware files for Xiaomi Air 2 (without the letter S) are incompatible with Air 2S! Installation of such firmware will lead to inoperability of headphones.

How to roll back the firmware to the previous version

If new bugs have appeared after the update (for example, the sound quality has deteriorated or the running time has decreased), you can return the old firmware version. ADB.

Important: The rollback is only possible if you have a backup of old firmware or can find it online. Xiaomi does not provide archival versions officially.

Step-by-step:

1. Download the desired firmware version (for example, V1.6.0.142) proven-source.
2. Connect your phone to your PC and move the firmware file to the platform-tools folder.
3. Open the command line and type in: adb push old_firmware.bin /sdcard/ adb shell am start -n com.xiaomi.hm.health/com.xiaomi.hm.health.upgrade.UpgradeActivity
4. In the Mi Fit menu that opens, select the downloaded file and confirm the installation.
5. Wait for the process to be completed (earphones will reboot 2-3 times).

If the retracement fails, try:

• 🔄 Use a different firmware version (for example, not Global, but rather EU).
• 📱 Swipe headphones through another device (tablet or second phone).
• 🛠️ Contact the service center – sometimes a programmer is required to roll back.

FAQ: Frequent questions about Xiaomi Air firmware 2S