How to improve Bluetooth on Xiaomi smartphones: from basic settings to hidden MIUI chips

Bluetooth on Xiaomi smartphones is often a source of frustration: interrupted sound in headphones, low volume, constant connection breaks or the inability to connect the device the first time. The reasons can lie both in hardware limitations (a weak module in budget models like Redmi 9A) and in software bugs MIUI, especially after updates. But in 90% of cases, the problem can be solved without going to the service center – it is enough to properly configure the system and take into account the features of Bluetooth 4.2/5.0/5.2 protocols.

In this article, we will discuss 10 proven methods, from elementary (reboot module) to advanced (change codecs through the developer). Separately, we will focus on the specifics of popular models: why the Poco X3 Pro “gluts” with AirDots, how to make the Redmi Note 12 work stably with a car radio, and why the Mi 11 Ultra sometimes “loses” devices after locking the screen. All instructions are relevant for MIUI 12/13/14 and HyperOS (2026).

1.Diagnostics problem: how to understand what is wrong with Bluetooth

Before settings, it is important to determine the nature of the malfunction, and symptoms may indicate different roots of the problem:

• 🔊 The sound is interrupted or distorted → codec-problem (AAC/SBC/aptX) or Wi-Fi/4G.
• 🔄 Permanent connection breaks → weak module signal or conflict with background processes.
• 🔌 The device does not connect the first time. → bug MIUI in Bluetooth cache or outdated firmware.
• 🔇 Low volume in headphones → The absolute volume level (Bluetooth Absolute Volume).

For accurate diagnosis:

1. Check if the problem is playing out with another Bluetooth device (e.g., a speaker instead of headphones).
2. Make sure the distance to the smartphone is not more than 10 meters (maximum Bluetooth 5.0 without interference).
3. Turn off Wi-Fi and mobile internet – if the sound stabilizes, interference at 2.4 GHz is to blame.

Critical: If the problem only manifests itself with a specific headphone model (for example, Xiaomi AirDots 3 Pro), the incompatibility of the firmware is most likely to be to blame, in which case only updating the MIUI or resetting the headphones will help.

2. Basic settings: what to check first

Start with the obvious – users often miss out on basic options that solve a problem in 2 minutes.

• 📱 Reboot the Bluetooth module: go to Settings → Connections → Bluetooth, turn off the slider, wait 10 seconds and turn it on again.
• 🔄 Remove the device and reconnect: press the gear next to the device → Delete → repeat.
• 🔊 Turn off the “Absolute Volume Level” (if the sound is quiet): in the Developer Settings, find Turn off the absolute volume level of Bluetooth.
• 📶 Check the energy saving mode: in Settings → Battery → Power saving mode disable Bluetooth restrictions.

Disconnect/enable Bluetooth module

Remove the problem device and reconnect

Turn off "Absolute Volume Level" in the Developer Settings

Check the energy saving mode

Update MIUI last-minute-->

Pay special attention to the developer settings, so you can activate them:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version.
3. Back to Settings → Additionally. → For developers.

⚠️ Note: On some models (Redmi Note 10 Pro, Poco) F3) post-update MIUI 14 Option Turn off the absolute volume level of Bluetooth may not be available, in which case resetting the network settings will help (see section 4).

3. Codec Optimization: Why Sound “Harrheas” and How to Fix It

Bluetooth audio quality depends on the codec used, the audio compression algorithm. By default, Xiaomi often chooses SBC (low quality but broad compatibility), although the device can support AAC, aptX or LDAC (for Hi-Res sound).

To change the codec:

1. Connect the headphones/column via Bluetooth.
2. Open the Developer Settings (see Section 2).
3. Find the Bluetooth Codec (or Bluetooth Audio Codec).
4. Choose AAC (for quality and stability) or aptX (if the device supports it).

Important: If the sound starts to break after changing the codec, go back to AAC – it’s the most balanced for Xiaomi. Also check if your audio device supports the selected codec (information is usually specified in the specs).

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If the developer’s settings don’t have a Bluetooth Codec option, try installing the Developer Options Shortcut app from Google Play – it displays all hidden options, including audio settings.

4. Network and Bluetooth reset: When nothing helps

If the basic methods don’t work, the next step is to completely reset the network settings, which will remove all stored Bluetooth devices, Wi-Fi points and mobile Internet settings, but often solves connection problems.

Instructions:

1. Go to Settings → System → Resetting settings.
2. Select Network Reset (not to be confused with a full reset!).
3. Confirm the action and restart the phone.

After discharge:

• 🔄 Connect the Bluetooth device again.
• 📱 Check if there are any updates. MIUI In Settings → The phone. → Updating the system.
• 🔊 Set up the codec (see Section 3).

⚠️ Attention: On Xiaomi models 12T redmi K50 After resetting the network, the option may disappear HD-You have to manually enable the audio in Bluetooth settings. HD audio ADB (see section 6).

5.Conflicts with Wi-Fi and 4G: how to eliminate interference

Bluetooth and Wi-Fi work on the same frequency, 2.4 GHz, so they can interfere with each other, especially in densely populated areas where there are many networks. Symptoms: the sound in the headphones "stutters", the connection breaks when you download files.

Decisions:

• 📶 Switch Wi-Fi to 5GHz (if the router supports) and this will eliminate interference completely.
• 📱 Turn off Wi-Fi when using Bluetooth (if 5GHz is not available).
• 📡 Change your router’s Wi-Fi channel: Select channel 1, 6, or 11 – they are the least intersected with Bluetooth.
• 🔄 Enable Bluetooth Priority Mode (available on some models in Developer Settings).

To check for interference, use the WiFi Analyzer (Android) app. If you have many neighbors on the same channel, change it in your router settings.

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If you have a Xiaomi Mi 10 or newer with Bluetooth 5.2 support, turn on Dual Audio mode (in Bluetooth settings).It uses two channels to transmit sound, which reduces the impact of interference.

6 Advanced Methods: ADB, Engineering Menu and Firmware Modification

If standard methods don’t work, you’ll need to use hidden MIUI features, which require caution but can radically improve Bluetooth.

Method 1: Inclusion HD-audio ADB

Some models (Redmi Note 11, Poco) F4) hide the option HD-audio in settings. To activate it:

1. Install ADB Tools on your PC.
2. Connect your phone via USB and allow debugging (Developer Settings → USB Debugging).
3. Adb shell settings put global settings bluetooth_hd_audio_enabled 1
4. Reboot the phone.

Method 2: Change Bluetooth Regional Settings

Some firmware has limited transmission power and supported codecs due to regional regulations.

1. Open the engineering menu by dialing in the phone app: ##4636###
2. Go to Phone Information → Wi-Fi settings (yes, Bluetooth settings are hidden here too).
3. Select Bluetooth Audio Codec and install AAC or aptX.

⚠️ Note: HyperOS models (e.g. Xiaomi 14) may not have an engineering menu. MTK Engineering Mode (only for MediaTek processor devices).

7. Hardware problems: when the "iron" is to blame

If the software methods did not help, the reason may lie in hardware defects:

• 📡 Poor Bluetooth antenna contact (a common problem after falling or disassembling your phone).
• 🔋 Battery wear - with a low charge (<15%) Bluetooth module can work unstablely.
• 🔥 Overheating of the processor - on the Snapdragon 888 (in Mi 11, Black Shark 4) with heating above 60°C Bluetooth is starting to "glutch».

How to check:

1. Install the AIDA64 app and check the processor temperature while using Bluetooth.
2. See the Bluetooth signal level in the engineering menu (#4636## → Phone information) Norm: -50 dBm and higher.
3. If the signal is weak (-70 dBm), the antenna is likely to be damaged.

Decisions:

• 🔧 To solder the antenna (cost of repair: 1-3 thousand rubles).
• 🔋 Replace the battery (relevant for phones over 2 years old).
• 🧊 Use a cooling stand for long-term music listening.

8. Alternative solutions: if nothing works

If you can’t improve your Bluetooth experience on Xiaomi, consider the alternatives:

• 🎧 Use headphones with aptX Adaptive (e.g. Sony) WH-1000XM5) — They are better at adapting to interference.
• 🔊 Connect devices through USB-C (It is supported by Xiaomi 13 Ultra).
• 📶 Buy an external Bluetooth transmitter (for example, 1Mii B06 Plus) for stable connection.
• 🔄 Reverse to the old version MIUI, If the problem occurs after the update.

For models with an infrared port (Redmi Note 8 Pro, Mi 10T), you can use an IR transmitter to control the audio system, but the sound quality will be worse.

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If you use Xiaomi in your car, try connecting via Android Auto instead of Bluetooth.This often solves the problems with communication breaks when calling.

FAQ: Frequent questions about Bluetooth on Xiaomi