Connecting F9 wireless headphones to Xiaomi smartphone via Bluetooth: a complete guide to problem solving

Wireless headphones Baseus F9 (or other models with the marketing designation “F9” — for example, Haylou GT1 F9, QCY F9) have become a popular choice among Xiaomi smartphone owners due to the combination of price, sound quality and battery life. However, even with such devices, users often face problems when connecting for the first time: the phone “does not see” headphones, the connection is constantly broken or the sound is interrupted. In this article, we will discuss not only the standard pairing procedure, but also the hidden settings of MIUI, which will help stabilize Bluetooth operation, and also diagnose typical errors.

The F9 headphones feature the use of a Realtek RTL8763B (or similar) chip, which sometimes conflicts with the Bluetooth 5.2/5.3 protocol in new Xiaomi smartphones (for example, Redmi Note 12, POCO X5). If you have already tried to connect through the standard menu and got an error, do not rush back the headphones - in 90% of cases the problem is solved software. Next, you will find step-by-step instructions for different versions of MIUI, tips for optimizing connections and answers to questions that are not covered even in official manuals.

1. Preparation of the F9 headphones for connection

Before pairing with a Xiaomi phone, you need to properly activate the search mode on the headphones themselves. For the F9 models (regardless of the brand - Baseus, Haylou, QCY), this process may differ, but the general logic remains.

• 🔋 Charge the headphones to at least 30%. Discharged devices may not enter pairing mode or shut down immediately after you connect. F9 It flashes red when it's low.
• 🎧 Remove the headphones from the case (if it is) TWS-Some versions are automatically activated when retrieved, others require manual start-up.
• 🔄 Reset (if the headphones have already been paired with another device). To do this, hold the power button (or touchpad) for 10-15 seconds until the indicator flashes red-blue (reset mode).
• 🔍 Activate Search Mode. This is usually a long press (3-5 seconds) on the power button before flashing blue/white (some models have two headphones blinking alternately).

If the indicator on the headphones does not respond to pressing, check:

• 🔌 Are they connected to charging (sometimes locking occurs when the discharge is below 5%).
• 🛠️ Is the button stuck (relevant for budget models after moisture hits).
• 📦 Does your model fit? F9 The claimed characteristics (there are many fakes with simplified electronics on the market).

⚠️ Attention: Haylou headphones GT1 F9 and QCY F9 For example, Haylou sometimes needs to press both headphones at the same time, and for the exact instructions, look for the manual for your model, it can be downloaded from the manufacturer's website by model number (listed on the box or under the cover of the case).

2. Standard Bluetooth connection on Xiaomi

If the F9 headphones have successfully entered pairing mode (flashing the indicator), go to the phone settings. Instructions are suitable for all Xiaomi smartphones on MIUI 12-14 (including Redmi, POCO, Black Shark):

1. Open Settings → Bluetooth.
2. Activate the Bluetooth slider (if it is turned off).
3. In the list of available devices, find the name of your headphones. It can look like: Baseus F9, Haylou GT1 F9, QCY-F9; LE-BES-F9 or BT-F9 (in some clones); arbitrary character set (for example, TWS-8763B - according to the name of the chip).

0000

1234

Once successfully connected, the headphones will stop flashing and will light up in blue/white, and some F9 models will hear a voice message "Connected".

If the headphones don’t appear in the list, try the following:

• 🔄 Update the device list (update button in the upper right corner of the Bluetooth screen).
• 📱 Restart your phone – sometimes the Bluetooth driver “hangs” after a long time.
• 🚫 Remove old pairings with other headphones (in the list of connected devices tap on the "⚙️" → "Forget the device").

⚠️ Note: On Xiaomi smartphones with Android 13+ (MIUI 14) can activate the function "Automatic Bluetooth Shutdown to Save Energy" To turn it off, go to Settings → Battery and productivity → Energy conservation → Energy saving settings → Additionally, and deactivate the option "Disable Bluetooth in standby mode".

3. Solving Connection Problems

If the F9 headphones don't connect at all times, the problem may be Bluetooth protocol conflicts, outdated firmware, or hardware constraints.

The F9 models on the Realtek RTL8763B have a problem with the firmware freeze. If the headphones stop responding to buttons or connect once in a while, try updating their firmware through official software (for example, Haylou Fun for Haylou GT1 F9). Links to firmware and instructions are usually posted on 4PDA forums or in brand telegram channels.

Headphones charged and paired |Bluetooth on the phone and not in power saving mode |No interference from other wireless devices |Tryed to reset the headphone settings |Tryed to connect to another phone for a test-->

4. Optimize Bluetooth on Xiaomi for stable performance

Even if the F9 headphones are plugged in, you can get lags, breaks in sound, or delays over time, and this is due to the Bluetooth stack settings in MIUI, which is optimized by default for energy savings, not sound quality. Here's how to improve the connection:

Selection of Bluetooth codec

By default, Xiaomi uses an AAC codec that can conflict with budget headphones. To force the SBC (more stable but with a lower bitrate):

1. Put the headphones on the phone.
2. Install the Developer Options Editor app from Google Play.
3. Activate Developer Mode (tap 7 times on the MIUI version in your phone settings).
4. In Settings → More → For developers, find the option “Bluetoothooth Codec” and select SBC.

4.2. power saving switch off for Bluetooth

MIUI aggressively optimizes background processes, leading to connection breaks, to avoid this:

1. Go to Settings → Applications → Application Management → Three Points (menu) → Special Access → Battery Optimization.
2. Find the "Bluetooth" list (or com.android.bluetooth) and select "No Limits".
3. Do the same for the app you play the sound through (e.g. Spotify, YouTube Music).

4.3 Reset Bluetooth settings on your phone

If problems persist, reset the Bluetooth module settings:

1. Open Settings → System and device → Resetting settings → Resetting network settings.
2. Select “Bluetooth Reset” (does not affect Wi-Fi and mobile data).
3. Reboot the phone and repeat the pairing.

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If the headphones still do not connect after reset, try to temporarily turn off Wi-Fi and mobile data - sometimes the conflict arises due to overloading of the phone's radio frequency module.

5. Features of connecting to specific Xiaomi models

Some Xiaomi smartphones have unique nuances of working with Bluetooth devices, and here are proven solutions for popular models:

• 📱 Redmi Note 11/12, POCO X4/X5: Conflict with protocol LE Audio (Bluetooth 5.2). Solution – Turn off Double Audio in Bluetooth settings.
• 📱 Xiaomi 12/13 Series: Problems with switching between devices. The solution is in the headphone settings (⚙️ → In addition), disable "Auto-connection".
• 📱 POCO F4/F5: Solution: install the aptX Low Latency codec (if supported by headphones).
• 📱 Redmi 10A/10C: Weak Bluetooth module. Solution: Keep your phone no more than a distance away. 50 headphone.

On smartphones with a chipset Qualcomm Snapdragon 4xx/6xx (Like Redmi. 9A, POCO M4 Pro) may need to disable the “Bluetooth Audio” function HAL" through ADB-team:

adb shell settings put global bluetooth_a2dp_offload_disabled 1

This command disables the hardware acceleration of audio, which sometimes solves the problems with the breaks of sound.

6. Alternative ways of connecting

If standard pairing doesn’t work, try alternative methods:

6.1. Connection through the manufacturer's application

Some F9 models (e.g. Haylou GT1 F9) require the installation of a proprietary application to work correctly:

• 📱 Download Haylou Fun (for Haylou) or QCY App (for) QCY F9) Google Play.
• 🔍 Register andfollowing instructions in the application perform pairing.
• ⚙️ Additional settings may be available in the application (e.g., game mode to reduce sound latency).

6.2 Developer mode connection

For power users: If the headphones are defined by the phone but not connected, try forcefully adding them via ADB:

1. Connect your phone to your PC and activate Debugging via USB.
2. The command is: adb shell am start. -a android.bluetooth.devicepicker.action.LAUNCH -e bluetooth_device_picker_filter_type 0
3. In the menu that opens, select your headphones manually.

Use of third-party applications

Applications like Bluetooth Auto Connect or Bass Booster can help stabilize the connection.

• 🎛️ Bluetooth Auto Connect – Automatically restores connection after break.
• 🔊 Bass Booster – Improves sound but can increase latency.
• 🛠️ Bluetooth Repair Tool – Resets the cache of the Bluetooth module.

⚠️ Note: When using third-party Bluetooth management apps, turn off battery optimization for them in settings MIUI, Otherwise, they will close in the background.

7. Frequent errors and their elimination

We will analyze the specific errors that occur when connecting F9 to Xiaomi, and how to fix them:

If after all the manipulations, the F9 headphones still do not work correctly, check them on another device (for example, on an iPhone or Android smartphone of another brand). If the problem persists, it is likely a malfunction in the headphones themselves (most often the Bluetooth module or battery fails).

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Before returning your headphones, make sure that the problem is not with your phone, and test them on 2-3 different devices (ideally iOS and Android).

FAQ: Answers to popular questions