Fast Boot on Xiaomi: How to Disable and Why You Need It

Have you noticed that your Xiaomi smartphone is turning on too fast? or after the update MIUI The device has become unstable when booting? most likely because of the function Fast Boot (fast boot), which is activated by default on most Redmi models, POCO This technology speeds up the system’s launch, but sometimes leads to crashes, especially if you use custom firmware or connect the device to a PC for debugging.

In this article, we will understand what Fast Boot is on Xiaomi, why it should be turned off in some cases, and provide current ways to deactivate it for the first time. MIUI 12, 13 and 14 (including hidden developer settings) and how to avoid typical shutdown errors and what to do if the changes stop loading. Instructions are suitable for models from Redmi Note 10 Pro to Xiaomi 14 Ultra.

What is Fast Boot and Why is it Shutting Down?

Fast Boot (not to be confused with fastboot mode for firmware!) is a fast boot technology that keeps the system core in RAM when you turn off the device. 2-3 seconds instead of standard 10-15. But there is a downside to this decision:

• 🔌 Connection problems to PC: when activated Fast Boot device may not be detected in the ADB Or Mi Flash Tool.
• 🔄 Failures after updates: If the firmware is installed incorrectly, a fast boot can lead to a cyclical reboot.
• 🛠️ Conflicts with Custom Recovery: TWRP OrangeFox may not start if Fast Boot is enabled.
• 📱 Incomplete shutdown: the device actually goes into “sleep” mode, which interferes with the diagnosis of hardware problems.

Disabling Fast Boot is recommended in the following cases:

• 🔧 You plan to flash the device through fastboot or EDL.
• 🖥️ You need to connect to the PC for debugging (ADB, Scrcpy).
• 🔄 Smartphone spontaneously reboots or "hangs" on the logo MI.
• 📦 Install custom firmware (LineageOS, Pixel Experience, etc.).

It's important to understand that Fast Boot and fastboot mode are different things: the first is responsible for fast booting, and the second is for low-level access to the device, and turning off one does not affect the other.

How to check if Fast Boot is enabled on Xiaomi

Before you turn off the function, make sure it's actually active. There are two reliable ways to check:

Method 1: Through the Developer's Settings

If you already have a developer mode enabled, follow the following steps:

1. Go to Settings. → The phone. → Version. MIUI Tap 7 times on this line to activate the developer menu.
2. Return to the main settings menu and select Additional settings → For developers.
3. Scroll down and find Fast Boot. If the switch is active, the function is on.

Method 2: Through the ADB team

If you have access to ADB (for example, through Platform Tools), follow the command:

adb shell settings get global fastboot_force_cold

Results:

• 0 – Fast Boot is enabled (fast boot).
• 1 – Fast Boot is turned off (complete shutdown).

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If the team returns the device unauthorized error, check that the smartphone is allowed to debug USB and access to your computer in the developer settings.

Step-by-step: how to disable Fast Boot on Xiaomi

There are three main methods of deactivating fast boot. MIUI device models.

Method 1: Through the settings menu (MIUI 12-14)

It’s the easiest way to run on most modern Xiaomi, Redmi and other devices. POCO:

1. Open Settings → Additional settings → For developers.
2. Find the Fast Boot (Fast Boot) option.
3. Turn the switch to the off position.
4. Confirm the action if a warning appears.
5. Reboot the device manually (press the power button and select "Reboot").

After restarting, the smartphone will turn off completely, rather than go into "sleep" mode. 10-15 seconds.

Method 2: Through the team ADB (for all versions MIUI)

If the settings do not include Fast Boot (this happens on some firmware for the POCO), use ADB:

1. Install Platform Tools on your PC.
2. Enable debugging over USB in the developer settings.
3. Connect your smartphone to your computer and execute the command: adb shell settings put global fastboot_force_cold 1
4. Reboot the device with the command: adb reboot

To get the Fast Boot back, replace 1 for 0 in the first team.

Method 3: Through build.prop editing (for advanced users)

This is a good way to go if the first two fail.Warning: improper editing of system files can cause a failure!

1. Download any file manager with root support (such as Root Explorer or FX File Explorer).
2. Go to /system/build.prop.
3. Find the line ro.boot.fastboot=1 and replace it with ro.boot.fastboot=0.
4. Save the file and restart the device.

If the smartphone does not boot after the changes, return the original value or restore build.prop from the backup.

What to do if the Fast Boot is not shut down

Sometimes users find that the switch in the settings is inactive or after turning off the function continues to work.

Problem 1: The gray switch in the settings

If the Fast Boot item is inactive:

• 🔹 Make sure you don’t have custom firmware (e.g. Xiaomi.EU or LineageOS) where this option can be removed.
• 🔹 Check that the developer mode is on (sometimes it resets after updates).
• 🔹 Update. MIUI Up to the latest version - in the old builds could be a bug.

Problem 2: After disabling Fast Boot, the smartphone does not turn on

If the device is “hanging” on the logo MI:

• 🔹 Connect your smartphone to charging and wait 10-15 Minutes - sometimes helps.
• 🔹 Squeeze the power. + Volume up 10 seconds to force reboot.
• 🔹 If nothing helps, go to fastboot mode. + Volume down) and reset via command: fastboot erase userdata Attention: this will delete all data from the device!

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If after disabling Fast Boot smartphone began to boot for more than 30 seconds, check the integrity of the firmware – you may need to flash through the Mi Flash Tool.

Problem 3: Fast Boot turns on after the update

In some versions MIUI (particularly POCO F3/F4) The fast boot function is activated automatically after the update:

• 🔹 Before updating, disable Fast Boot via ADB (method).
• 🔹 After the update, do not click “Reboot Now” – first turn off Fast Boot manually.
• 🔹 Use it. MIUI bootloader to install updates manually, not through OTA.

Fast Boot and custom firmware: what you need to know

If you are installing LineageOS, Pixel Experience or other custom firmware, Fast Boot must be turned off. Otherwise, you may encounter:

• 🔹 Cyclical restart (bootloop) after installation.
• 🔹 Inability to enter recovery (TWRP non-start).
• 🔹 Errors of section mounting /data.

Instructions for users of custom firmware:

1. Disable Fast Boot before installing a new firmware (via ADB or setting).
2. Install the firmware through TWRP Or OrangeFox.
3. After the first boot of the new system, do not turn on Fast Boot unless the firmware is optimized for Xiaomi.

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On some custom firmware (for example, ArrowOS), Fast Boot can work correctly, but it is better to clarify this in the topic of firmware on the forum. XDA Developers.

If after installing custom firmware you forgot to turn off Fast Boot and the device does not boot, try:

1. Getting into fastboot mode (Food) + Loudness down).
2. Run the command: fastboot oem edl to transfer the device to EDL-Mode and flash stock firmware through Mi Flash Tool.

The Impact of Fast Boot on Battery and Performance

Many users fear that disabling Fast Boot will negatively affect the autonomy or speed of the smartphone.

Myth 1: Fast Boot saves battery life

In fact, the Fast Boot does not affect battery consumption when turned off.The device consumes minimal current (about the same time). 0.1-0.3 mA/h) whether you're on fast boot or not, the difference is that with Fast Boot, some of the core is in RAM, but it doesn't increase power consumption.

Myth 2: Without Fast Boot, your smartphone will slow down.

The fast boot function does not affect normal performance, it speeds up the on-on process, but does not affect:

• 🔹 Application Opening Speed.
• 🔹 Smoothness of animations.
• 🔹 Productivity in games.

The only time when disabling Fast Boot can slow down a smartphone is if you constantly reboot it (for example, for testing). 5-10 longer.

When is Fast Boot really useful?

Despite the possible problems, the fast download feature has its advantages:

• 🔹 Convenience: Smartphone is always ready to work for 2-3 seconds.
• 🔹 Less wear and tear of flash memory: when completely turned off / on, more recording operations occur.
• 🔹 Compatibility with MIUI-Chips: Some features (e.g. Always-on Display) work better with Fast Boot enabled.

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If you are not engaged in firmware and do not connect your smartphone to your PC for debugging, Fast Boot can be left on – this will not harm the device.

FAQ: Frequent questions about Fast Boot on Xiaomi