Modern Xiaomi smartphones have powerful multimedia potential, which is often hidden by default for the sake of compatibility with any accessories. Device owners who want maximum sound quality often face restriction with standard SBC or AAC codecs, which do not transmit the entire spectrum. Changing Bluetooth settings allows you to unlock support for advanced compression algorithms such as aptX HD, LDAC or LHDC, if your equipment allows it.
The process of activating hidden functions requires care, as it affects the system parameters of the engineering menu. It is important to understand that the result depends not only on the software settings of the phone, but also on the capabilities of the connected headphones or speakers. In this article, we will discuss in detail the safe methods of activating Hi-Res audio and look at what nuances the MIUI operating system hides.
Before we get into the manipulation, it’s worth noting that the developer menu interface may differ depending on the firmware version. HyperOS and older versions of MIUI have a similar structure, but item names may vary. We’ll look at the universal steps that will suit most current models, from the budget Redmi to the flagship Mi and Mix series.
Discuss the main Bluetooth codecs and their impact on sound
The quality of wireless audio transmission depends on the coding algorithm used. The standard SBC (Sub-band Coding) codec is mandatory for all devices, but it provides the least quality due to aggressive data compression. It is quite enough for listening to podcasts or watching videos on social networks, but audiophiles will notice the loss of detail in high frequencies.
More advanced algorithms like AAC, AAC-LC and aptX offer better detail. Apple devices have traditionally used AAC, which works effectively in the iOS ecosystem, but on Android its implementation can vary.The aptX codec developed by Qualcomm provides low latency and higher bitrate, which is critical for gaming and watching movies without desynchronization.
The top of the list is Sony’s LDAC codecs and LHDC, developed with Huawei and Savitech, which are capable of transmitting data at bitrates of up to 990 kbps, three times more than standard Bluetooth, and LDAC and LHDC are the ones that allow audio to be transmitted at 24-bit/96kHz resolution without noticeable losses, bringing wireless sound closer to wired Hi-Res.
- 🎧 SBC: Basic codec, available everywhere but has poor sound quality.
- 🎵 AAC: A good balance of quality and efficiency, standard for iPhone.
- 🚀 aptX HD / LDAC: High bitrate for demanding listeners.
- ⏱️ aptX Low Latency: Specialized codec to minimize delays in games.
If the headset only supports SBC, activating the LDAC in the phone will not work, since the connection will be established at the lowest common denominator. So before changing the settings, be sure to read the technical documentation for your acoustic system.
Activation of the developer menu on Xiaomi smartphones
To access hidden Bluetooth settings, you need to activate a special menu reserved for application developers. By default, this section is hidden from the eyes of the average user to prevent accidental changes in critical system parameters. The activation process is simple, but requires precise execution of the sequence of actions.
You need to go to the basic settings of the device and find the item "About the phone." Here is the version information. MIUI, CPU and other technical statistics. Find the line "Version" MIUI» (or "Version" OS» In new firmware) and quickly click on it 7-10 successively.
⚠️ Attention: After 3-4 You press the phone and you warn you that you're becoming a developer. Don't stop, keep clicking until you say, "You're a developer!».
Once you successfully activate the main settings menu, "Additional" or "Extended Settings," you'll see a new "Developers" option, and that's where the codec management keys are, and if you can't find that right away, search by settings by typing "Developer."
Step-by-step instructions for changing the Bluetooth codec
Once you log into the Developer Menu, you'll need to scroll down to the Web or Bluetooth section, where you have a key option that allows you to force the coding algorithm to be selected, and the default system is System Codec, which means you automatically select the best option available.
Click on Bluetooth Codec, and you will see a list of all codecs supported by your CPU and radio module, and if a codec is gray or not listed, your hardware or current driver version does not support the technology.
Select the codec you want from a list like LDAC or aptX Adaptive. Once selected, the system can interrupt the Bluetooth connection for a second to apply new settings. Make sure your headphones are connected at the time of setting up to immediately evaluate the result.
☑️ Check before changing the settings
In some cases, especially on older versions of MIUI, once the codec is selected, you need to reboot the device or re-pair the gadget. Turn off Bluetooth, turn off the headphones, then turn them on again and pair them, ensuring that the handshake protocol passes with new priorities in mind.
| Codec | Max. bitrate. | Quality. | Delay. |
|---|---|---|---|
| SBC | 328 kbps | Basic | Tall. |
| AAC | 256 kbps | Good. | Medium |
| aptX HD | 576 kbps | High. | Low. |
| LDAC | 990 kbps | Hi-Res | Medium/High |
Using ADB for advanced audio tuning
If the standard developer menu does not give the desired result or the desired options are blocked by the manufacturer, you can use the tool ADB (Android Debug Bridge), which requires connecting a smartphone to a computer and having basic knowledge of working with the command line, but opens access to deep system settings.
First, you need to enable USB debugging in the same Developer menu, connect your phone to your PC with a cable, and type in a connection check command, and if it goes well, you can change the global Bluetooth settings through the terminal.
adb shell settings put global bluetooth_codec_config 6In this command, the number “6” corresponds to a specific codec (for example, LDAC), however, the numbering may vary depending on the version of Android. Using ADB also allows you to reset the Bluetooth stack cache if the connection is unstable after changing the settings.
⚠️ Note: Introduce incorrect commands through ADB This can cause the communication module to work in an unstable way. Be careful and write down the initial values before changing them.
There are also specialized apps from Google Play, such as Bluetooth Codec Changer, that automate the input process. ADB-They require a single connection to the PC to issue permits, and then allow you to change the codecs directly from the screen of the smartphone.
Compatibility and stability of the connection
The transition to high-resolution codecs, such as LDAC, often comes with connection stability in favor of quality. Algorithms with less compression require a wider data channel, which makes the signal vulnerable to interference in crowded air (malls, offices with many Wi-Fi routers).
If you notice a sound interruption, stuttering, or a complete connection break, try lowering the bitrate in LDAC settings. The developer menu often has an option called LDAC Sound Quality, where you can choose to prioritize: Sound Quality, Balance, or Connection Priority. Selecting Connection Priority Mode will improve stability but reduce detail.
It's also worth considering the distance to the source of the signal. When using high-bitrate codecs, the radius of confident reception can be reduced by 20-30%. If the phone is in the back pocket of jeans and the headphones are wireless, the human body can shield the signal, causing artifacts.
The Impact of MIUI and HyperOS Version on Audio Customization
Xiaomi regularly updates its shell, and with each major release, the menu structure may change. In earlier versions of MIUI, codec options were more accessible, while in new builds of HyperOS, there is a tendency to hide these settings to optimize power consumption.
Users note that global firmware versions (Global ROM) may have a narrower list of available codecs than the Chinese versions (China ROM), due to licensing restrictions and regional hardware certification features, and sometimes installing India or China in the phone's settings helps unlock additional options.
In addition, some smartphone models have hardware limitations: Budget processors of the Snapdragon series 400-rd or 600-series may not support aptX HD or LDAC at the iron level, regardless of the software version.
Additional parameters for improving quality
In addition to choosing a codec, there are other options on the developer menu that affect sound, such as the “Disable Absolute Volume” option that allows you to untie the volume adjustment of your phone and headphones, which is useful if your headphones have their own DAC and amplifier, and you want to avoid double amplification or digital distortion.
Also worth paying attention to the option “Allow Bluetooth MAP”, which, although it refers to the transmission of messages, can affect background synchronization processes, indirectly affecting the stability of the audio stream.
Delay settings are critical for gamers. Even with aptX Low Latency, MIUI system delays can make adjustments. In some cases, turning off Absolute Volume and rebooting Bluetooth service through ADB commands: adb shell am broadcast -a com.android.bluetooth.btservice.ActionFactoryTest helps.