Boot Audio in Xiaomi Phone: What It Is, Why You Need It, and How to Manage Sound When Downloading

Have you ever noticed the short beep that comes out when you turn on a Xiaomi smartphone? This sound is not a fluke or a bug, but a specially programmed feature called Boot Audio, which accompanies the boot process of the operating system and serves not only an aesthetic purpose, but also performs practical tasks, from confirming a successful start to diagnosing hardware problems.

In this article, we will take a closer look at what Boot Audio is in Xiaomi phones, why it can change or disappear, and how to manage it from a complete shutdown to a custom sound replacement. You will also learn which models support this feature, how it is associated with the Fastboot and Recovery modes, and what to do if the sound when booting became suddenly loud or, conversely, disappeared for no apparent reason.

We'll focus on common myths, like that Boot Audio is supposedly "battery-setting" or that it's in violation of warranty. Spoiler: it's not. And you'll find instructions for advanced users who want to replace the standard sound with their own. ADB or TWRP.

What is Boot Audio and Why You Need It in Xiaomi

Boot Audio (or "boot sound") is a short audio signal that is played when the smartphone is turned on, immediately after the appearance of the Xiaomi or Redmi logo. MIUI serves several purposes:

• 🔊 Proof of health: sound indicates that the hardware (speakers, audio chip) and software (system core) are functioning correctly.
• 🛠️ Fault diagnosis: lack of familiar sound may indicate problems with the speaker, charging connector or firmware damage.
• 🎵 Xiaomi uses unique tunes for different series of smartphones (for example, the Mi 11 and Redmi Note 10 sound different), which strengthens the corporate identity.
• 🔄 Load mode signal: Some models have different sound when logging into Fastboot or Recovery Mode.

It's important to understand that Boot Audio is not the same as the lock/unlock screen or notification sound, it plays back once every time you turn on the device and is independent of the media volume or alarm settings. MIUI (starting MIUI 12) the download sound may be dynamically varied depending on the theme or regional settings.

Interesting fact: some Xiaomi models (for example, POCO F3 or Mi 10T) Boot Audio is accompanied by vibration, and this is done for users with hearing impairments or for situations where the sound is turned off.

What models Xiaomi has Boot Audio?

Boot Audio feature is present in almost all Xiaomi smartphones released after 2018, but its implementation varies depending on the series and version. MIUI. Below is a table with examples of models and their features:

Note: In budget models (e.g. Redmi) 8A Boot Audio can be simplified or absent due to hardware platform limitations, and download audio is often turned off in custom firmware such as LineageOS or Pixel Experience.

If you are not sure if your model has Boot Audio, try restarting your phone with the sound on (Sound Mode or Vibration Mode). + If there's no signal, it may be disabled in the settings or your firmware doesn't support it.

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To hear Boot Audio more clearly, set the maximum media volume before rebooting – this does not affect the load signal level, but will help it to hear better.

How to disable Boot Audio in Xiaomi: official and unofficial ways

If the download sound bothers you (for example, you often reboot your phone at night or in public places), it can be turned off. Xiaomi does not provide a direct option for this in the settings. MIUI, But there are several working methods, from simple to advanced.

Method 1: Disconnect through the developer settings (for MIUI 12–14)

This method works on most modern models, but requires activation of the developer mode:

1. Go to Settings. → About the phone and 7 times click on the version MIUI, to unlock the developer mode.
2. Return to the main settings menu and select Additional settings → For developers.
3. Find the option to turn off download audio (or Disable boot sound in global firmware) and activate it.
4. Reboot your phone to make the changes take effect.

Method 2: Remove the system sound file (requires root)

For power users: Boot Audio is stored in a system file /system/media/audio/ui/PowerOn.ogg. If you delete it or rename it, you turn off the download sound:

• 🔓 Root rights (for example, through Magisk).
• 📁 File Manager with access to the system partition (e.g., Root Explorer).
• 🔄 Backup in case something goes wrong.

Warning: Mistakes with system files can lead to bootloop (a looped boot).

Method 3: Replace the sound through ADB (rootless)

If you don’t have root, you have access to it. ADB, You can replace the standard sound with a silent file:

adb shell


su




mount -o rw,remount /system




cp /sdcard/PowerOn.ogg /system/media/audio/ui/PowerOn.ogg




chmod 644 /system/media/audio/ui/PowerOn.ogg




reboot

Where /sdcard/PowerOn.ogg — Your empty or quiet audio file in.ogg format.

Why Boot Audio Could Be Lost or Changed

If the usual download sound suddenly disappeared or changed, it is not always a cause for panic.

• 🔄 Firmware update: Xiaomi sometimes changes Boot Audio in new versions MIUI. For example, after updating with MIUI 12 on MIUI 13 The sound can become quieter or shorter.
• 🔊 Audio Driver Failure: If the sound is lost not only when downloading, but also in other applications, the problem may be in the corrupted file. audio_policy.conf.
• 📱 Hardware malfunctions: damage to the speaker, charger connector or audio chip (for example, Qualcomm) WCD9340 Mi 10 often causes all system sounds to disappear.
• 🔧 Castom firmware: firmware like Xiaomi.eu or LineageOS can remove Boot Audio as "unnecessary branding".
• 🔇 Do not disturb: in some models (for example, POCO X4 Pro) the boot sound is automatically switched off if the mode has been activated before the switch is turned off DND.

Critical information: if Boot Audio went missing after a failed update OTA, This may indicate damage to the section. /system. In this case, it is recommended to reflash the phone via Fastboot using the official image from Xiaomi.

To diagnose the problem, follow the following steps:

1. Check if other system sounds (calls, notifications) are being played.
2. Connect the headphones – if the boot sound is in them, the problem is in the dynamics.
3. Download to Recovery Mode (hold power) + Volume Up when turned on) – if there is a sound there, but not in the system, the firmware is to blame.

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If Boot Audio is missing after a phone drop or moisture hit, there is an 80% probability that the problem is hardware – a speaker or motherboard diagnosis is required.

Can you replace Boot Audio with custom sound?

Yes, it's possible to replace a standard Boot Audio with your own sound, but it will require technical skills. Here are three main ways:

1. Through TWRP (requires an unlocked loader)

If your Xiaomi has custom recovery installed (TWRP), You can manually replace the sound file:

1. Download the audio file in.ogg format (maximum 3 seconds, mono, 44.1 kHz).
2. Rename it PowerOn.ogg.
3. Boot in. TWRP, mount the section /system and replace the file along the way. /system/media/audio/ui/.
4. Clear the cache (Wipe) → Dalvik/ART Cache and reboot.

2. Through the Magisk module

For Magisk devices, there are ready-made modules that replace Boot Audio without manual editing of system files. For example, the Boot Sound Changer module allows you to select sound from a gallery or download from a collection.

3. Through ADB (rootless, but with limitations)

As mentioned earlier, you can replace the file through ADB, But it doesn't work on all models, and the main limitation is that after the update, MIUI Your custom sound may be reset.

Important: When replacing Boot Audio, follow the following rules:

• 🎵 The file format is.ogg (not.ogg.mp3 or wav).
• ⏱️ Duration - no more than 3-4 seconds.
• 🔊 Loudness, no higher. -10 dB, otherwise the sound will be distorted.
• 📁 File size - up to 500 KB.

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To create a suitable audio file, use Audacity: export to Ogg Vorbis format with a bitrate of 128 kbit / s and a frequency of 44100 Hz.

Boot Audio and fault diagnosis

Boot Audio can serve as a health indicator for a phone, and here are a few scenarios to look out for:

• 🔴 The sound is interrupted or distorted: possibly damaged audio chip or speaker. In models with stereo speakers (for example, Mi 11) check both.
• 🟡 There's a sound, but it's very quiet, and it could be a clogging of the speaker with dust or a membrane that's damaged.
• 🟢 The sound changed after the update: it's okay if the firmware is official, but if the sound is replaced by "robotic" or intermittent, it may be damaged firmware.
• ⚪ No sound at all: check if Air Mode is activated before turning off (in some models, this turns off all sounds, including Boot Audio).

If you suspect a hardware malfunction, run the speaker test:

1. Dial the dialer code ##4636##.
2. Select Equipment Testing → Audio.
3. Test both speakers (top and bottom, if any).

If the speakers are working but Boot Audio is missing, the problem is software. Try resetting to factory settings (Settings) → The phone. → Reset settings), but do a data backup first.

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In models with Qualcomm Snapdragon (for example, POCO X3) Boot Audio may be due to partition damage modemst1/st2 — In this case, only the re-flashing through EDL Mode.

Myths and Truths About Boot Audio in Xiaomi

There are many myths around Boot Audio, and we'll take a look at the most popular ones.

⚠️ Note: Disabling Boot Audio does not affect Xiaomi's warranty.The manufacturer does not consider it a system modification unless you use root or custom firmware.

Myth 1: “Boot Audio is powering the battery.”

Truth: The boot sound is played once on and lasts 1-3 seconds. Its effect on battery consumption is negligible (less than 0.01% of charging). MIUI.

Myth 2: “If you turn off Boot Audio, your phone will boot faster.”

Truth: Sound plays in parallel with the system boot and does not affect the system speed. MIUI and hardware characteristics (e.g., type of memory) UFS 2.1/3.0).

Myth 3: “Boot Audio can only be turned off from root.”

Truth: Most models do this through the developer settings (see section above). Root is only needed to replace the sound with custom.

Myth 4: “If the Boot Audio is missing, the phone will soon break.”

Truth: No sound is not a sentence. It can be either a harmless failure after an update or a symptom of a serious malfunction. It depends on the context (see "Failure Diagnostics").

FAQ: Frequent questions about Boot Audio in Xiaomi