Have you ever noticed that your Xiaomi smartphone turns on in just a few seconds, but sometimes after a reboot, there are strange glitches? For example, notifications do not work, mobile Internet disappears or applications do not update. The fault may be the Fast Boot mode, a feature that speeds up the system’s launch, but does not always work correctly. In this article, we will analyze what Fast Boot on Xiaomi is, how it works, in which cases it is useful, and when it is better to turn it off.
Many users confuse Fast Boot with fastboot mode, a firmware mode that is activated when power and volume buttons are pressed. These are actually two different technologies: fastboot mode is used for firmware and modifications, and Fast Boot (or “Fast Boot”) is a system feature that optimizes the process of turning on a smartphone. It works at the level of the MIUI operating system and is available on most Xiaomi, Redmi and POCO models.
If you've never heard of Fast Boot, but your phone turns on too fast, it's probably already active by default, in some cases it saves time, but sometimes it causes problems, and then we'll tell you how to check it, manage it, and what to do if it causes a smartphone to become unstable.
What is Fast Boot on Xiaomi and how does it work?
Fast Boot is a feature in MIUI that speeds up the process of turning on a smartphone by keeping the core state in memory. Unlike a complete shutdown, where all processes are completed and then restarted, Fast Boot leaves some of the system components in a sleep mode, which is similar to hibernation on computers, but with some differences.
When you press the power button to turn off your phone with the active Fast Boot, the device doesn't shut down completely.
- 🔄 The current state of the Android kernel in RAM is saved.
- 📴 Disable the display, processor and peripheral modules (camera, sensors, modems).
- 🔋 Energy consumption is reduced to a minimum, but not to zero (as with a full shutdown).
- ⚡ When the next turn on, the system is restored from the saved state, rather than being booted from scratch».
This allows the smartphone to turn on in 2-5 seconds instead of the usual 10-20. However, the method has disadvantages: if before the “turndown” in the system there were errors (for example, a suspended application or a failure of the mobile network), they can persist and manifest after re-energizing, which is why sometimes after Fast Boot mobile Internet does not work, notifications do not come or applications slow down.
Differences between Fast Boot and Deep Sleep and Full Shutdown
To understand when to use Fast Boot, it is important to understand the differences between Xiaomi’s power saving modes.
| Regime. | Energy consumption | Incorporation speed | Preservation of condition | When to use |
|---|---|---|---|---|
| Fast Boot | Low (not zero) | 2-5 seconds | Maintains the core and part of the process | For a quick restart without a full shutdown |
| Deep Sleep (Deep Sleep) | Minimum | 8-15 seconds | It only saves critical data. | To save charge with long-term simple |
| Total shutdown | Zero. | 15-30 seconds | Nothing saves. | Failures, updates or prolonged storage |
Deep Sleep is an intermediate mode between Fast Boot and full shutdown, which shuts down almost all components except the minimum required to wake up (such as the power button or alarm clock), in which the phone uses less power than Fast Boot, but lasts longer.
The critical difference is that when you shut down completely, you reset all the temporary data, including the app cache and the status of the communication module. This helps to “zero” system errors that may have accumulated during operation. So if your Xiaomi has started to glitches (for example, does not catch the network or slows down), the first thing to do is turn it off completely, rather than using Fast Boot.
How to turn on or off Fast Boot on Xiaomi
Fast Boot is hidden in MIUI settings, and the path to it may vary depending on the firmware version. Here is a universal guide for most Xiaomi, Redmi and POCO models:
- Open the Settings app (cog icon).
- Go to the section Features → Additional settings (on some models the path may be System → Advanced settings).
- Find the Quick Download option (or Fast Boot in English firmware).
- Activate or deactivate the switch.
If your MIUI version doesn’t have such a clause, try an alternative way:
1. Enable Developer Mode: Go to Settings → About Phone and 7 times click on MIUI Version.
2. Return to Settings → Additional → For developers.
3. Find the Quick Boot option (could be called Quick Boot).Turn off Fast Boot in the settings
Turn off your phone completely (press the power button → “Switch off”)
Wait 10 seconds and turn on the device.
Check if this solves the problem with the glitches-->
Attention! On some models (such as Xiaomi 12T or Redmi Note 11), the Fast Boot function can be hidden or operated by default without the possibility of turning off, in which case you only need to reset your network settings or perform a full rebuke via fastboot mode.
When Fast Boot is Useful and When It Interrupts
Fast Boot is not universal: it saves time in some scenarios, it creates problems in others, and we'll figure out when to use it and when to turn it off.
✅ When Fast Boot is Useful:
- ⚡ You often turn off your phone (such as at work or in transportation) and want to turn it on quickly.
- 🔋 Battery discharges too quickly, and Fast Boot helps save charge during short-term pauses.
- 📱 You have an old Xiaomi model (like Redmi). 4X or Mi A1), where full loading takes more than 20 seconds.
❌ When Fast Boot gets in the way:
- 📶 After switching on, mobile internet or Wi-Fi does not work (reboot is required).
- 🔔 Notifications from messengers (WhatsApp, Telegram) or mail.
- 🤖 Apps fly off or brake after 'quick' turn on.
- 🔄 The phone spontaneously reboots or freezes.
⚠️ Note: If you use Xiaomi with custom firmware (such as LineageOS or Pixel Experience), Fast Boot may not work properly or even be available. TWRP or fastboot.
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If the phone has been on too long after the Fast Boot has been turned off, try clearing the cache in Recovery mode. To do this, press the Power + Volume buttons up when the device is off, select Wipe Cache and confirm the action.
How to completely turn off Xiaomi if Fast Boot interferes
If you're experiencing a bug due to a Fast Boot, it's not enough to just click "Switch off" in the power menu, and then you have to complete a complete shutdown that resets all the time data. Here's how to do it:
- Press the power button for 2-3 seconds until the menu appears.
- Select Turn Off (not Reboot!).
- After turning off the screen, wait 10-15 seconds – this is enough for the capacitors to discharge, and the core of the system to stop completely.
- Turn the phone on again with the power button.
If even after that, problems persist (for example, the network is not working), try a forced reboot:
1. Press the Power + Volume buttons down for 10-15 seconds.
2. wait for the vibration or the appearance of the MI logo.
3. Release the buttons and wait for the full load.⚠️ Note: Some models (e.g. Xiaomi 13 Pro or X-ray) POCO F5) Forced reboot can cause system integrity checks. If the phone then requests Mi Account password, enter data from your Xiaomi account.
Fast Boot and MIUI Updates: What You Need to Know
Fast Boot feature may conflict with updates MIUI. If you are installing the firmware through fastboot mode or OTA-update, but the phone doesn't change after the reboot, it might be "fast boot." Here's what to do:
- 🔄 Before updating, turn off Fast Boot in the settings.
- 📥 Install the update through Settings → The phone. → Updating the system.
- 🔋 When the installation is complete, turn off the phone completely (do not restart!).
- ⏱️ Wait 30 seconds and turn on the device.
If the firmware is installed via fastboot mode (for example, when unlocking the bootloader), be sure to turn off the Fast Boot in advance. Otherwise, a failure may occur and the phone will stop turning on.
What if the phone is stuck on the MI logo after the update?
Alternatives to Fast Boot: how to speed up loading without glitches
If Fast Boot is causing problems but you want your phone to turn on quickly, there are alternative ways to do this:
- 🔋 Autoboot Optimization: Disable Autostart of Unnecessary Applications in Settings → Annexes → Auto-run. The fewer programs loaded at start-up, the faster the system turns on.
- 🧹 Cache Cleanup: Clean the cache regularly through Settings → Warehouse → Clear the cache, it'll speed things up. MIUI after-in.
- 🔄 Developer Mode: Activate the option to Accelerate GPU-rendering in the developer settings, which will speed up the rendering of the interface.
- 📱 Light firmware: If you have an older model (like Redmi 5), try custom firmware based on Android Go – it’s optimized for weak iron.
⚠️ Note: Do not use Android apps from Google Play (such as Clean Master or Google Play) to “accelerate” Android. DU Not only does it not help, it can slow down the system by creating background processes.
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Fast Boot is convenient for quick on, but not suitable for solving system problems. If the phone is buggy, always start with a full shutdown, not a "fast" reboot.