Xiaomi Mi 9 is one of the most popular devices of the brand, but even with it sometimes there are problems when turned on. It does not matter whether the battery is running to zero, the phone is stuck on the logo after the update, or you simply can not find the power button – in this article we will analyze all possible scenarios and give clear instructions.
The Mi 9’s feature is that it’s powered by battery status, firmware version, and even body temperature. For example, when it’s deep discharge, it may not respond to charging for 10 to 15 minutes, and after a failed upgrade, it may go into an endless reboot. We’ll look at not only standard methods, but also hidden features that aren’t mentioned in the official manuals.
If your Xiaomi Mi 9 doesn’t turn on after falling or getting moisture, it’s a matter of hardware repair, and such cases are beyond the scope of this article.
Standard Enablement: Where the Button Is and How to Use It
At first glance, the inclusion of the Xiaomi Mi 9 should not raise questions: just press the power button for a few seconds.
- 🔍 The power button is located on the right side of the body, just below the volume control, and is easily confused with volume keys, especially in the dark.
- ⏱️ Retention time: to turn on, you need to press the button for 2-3 seconds (no longer than 5, otherwise a forced reboot will work).
- 🔋 If the battery is discharged to 0%, the smartphone may not respond to the press even after connecting the charge - you need to wait 10-20 minutes.
- 📱 On the lock screen, swipe up does not turn on the phone - it is unlocking, not starting the system.
It’s important to note that the Mi 9 comes with a fast boot that’s activated by default, which means that when you turn off the menu, the smartphone actually goes into low power mode rather than shutting down completely. To guarantee that you turn off the device before you turn on, hold the power button until the menu with the option to turn off (about 5-7 seconds) appears.
If you press the power button and the screen is black, but you feel vibrations or hear the boot sound, the problem may be the backlight of the display. Try to hold the phone to a bright light source at an angle: sometimes the image is visible in certain lights.
Incorporation after deep battery discharge
The Xiaomi Mi 9 battery (with a capacity of 3300 mAh) is sensitive to full discharge. If the battery is dead to zero, the smartphone may not show signs of life even after connecting to the charger.
- Use the original adapter (or Quick Charge 4+ support). Laptop charging or uncertified cables may not provide enough current to "wake up" the power controller.
- Wait 15 to 30 minutes. At deep discharge, the smartphone starts charging only after the battery voltage reaches the minimum threshold. The screen may remain off, but the charging indicator (if any) should flash.
- Try another cable or port, and sometimes the problem is a damaged wire or a damaged one. USB-A computer port that does not provide enough power.
- Heat the phone in your hands (if it's cold). Lithium batteries don't take charge well at low temperatures. Just hold the device in your palms for 5-10 minutes.
If after 30 minutes of charging the smartphone and does not show signs of life, try forced start:
- Connect the charger.
- Hold the power button for 10-15 seconds (even if nothing seems to be happening).
- If the Mi logo appears, release the button and the phone will start loading.
☑️ Checklist for battery discharge
Critical information: if after a deep discharge the smartphone turned on, but immediately turned off with the error "Battery low cannot do normal boot", you need to urgently charge it to 10-15% and reset through Recovery. Ignoring this error can lead to damage to the power controller.
Forced reset when getting stuck
Xiaomi Mi 9 can hang on the Mi logo, black screen or in the process of updating. In such cases, it helps hard reset, which does not erase data, but forcibly restarts the system.
- Hold the power button for 10-15 seconds until the screen goes out.
- If the phone vibrates but the screen doesn’t go out, hold the button for longer (up to 20 seconds).
- After turning off, wait 30 seconds and turn on your smartphone in the standard way.
If the hanging occurs regularly, it may indicate:
- 🔄 Application conflict (especially after update) MIUI).
- 🛠️ Damage to system files (reflashing required).
- 🔋 Battery malfunction (if freezes are accompanied by sudden shutdowns).
For diagnostics, try booting into Safe Mode (Safe Mode):
- Turn off the phone.
- Hold the power button until the Mi logo appears.
- Immediately after the logo appears, press and hold the volume button until the download is completed.
Safe Mode displays Safe Mode in the lower left corner, and if the phone is stable, it's a problem in one of the apps installed.
What to do if the phone is on the update screen?
Enable via Recovery Mode (if the phone doesn't boot)
If the Xiaomi Mi 9 doesn’t turn on normally but is responsive to charging (a burning indicator), you can try running it through Recovery Mode.
- 🔄 Reset to factory settings (if the phone is blocked or infected with a virus).
- 📦 Install the update manually (if the automatic firmware flew off).
- 🛠️ Check the integrity of system files.
To enter Recovery:
- Turn off your phone (if it is suspended).
- Hold the power button and the volume button at the same time.
- When the Mi logo appears, release the power button, but keep the volume up until you see the Recovery menu.
In the Recovery menu, the volume buttons (move) and the power button (select) are controlled.
| Option. | Description | When to use |
|---|---|---|
| Reboot | System restart | If the phone is stuck but previously worked normally |
| Wipe Data | Reset to factory settings (deletes all data!) | When blocking, viruses or critical errors |
| Connect with MiAssistant | Connecting to a PC for firmware | If you need to reflash your phone using the Mi Flash Tool |
| Mount | Connecting internal memory to a PC | To copy firmware or backup |
Warning: Wipe Data completely deletes all data, including photos, contacts and apps. If you do not have backup enabled in Mi Cloud, it will be impossible to recover information.
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If the Recovery menu doesn't have a sensor, use the volume buttons for navigation and the power button for confirmation. On some versions of MIUI, touch control is disabled in this mode.
Incorporation after firmware update
Updating MIUI to Xiaomi Mi 9 usually goes smoothly, but sometimes after installation, the smartphone can:
- 🔄 Fixing on the Mi logo (infinite download).
- 📵 Turn off and stay off.
- 🤖 Download in Fastboot Mode (black screen with a hare in a hat-hushanka).
In most cases, the following sequence of actions helps:
- Connect your phone to charge and wait until the battery is charged to at least 30%.
- Perform a forced reboot (hold the power button for 15 seconds).
- If Fastboot Mode appears, select the Reboot option using volume buttons and confirm with the power button.
- If the download loops, log in to Recovery and select Wipe Cache (not to be confused with Wipe Data!).
If the update crashed due to memory shortage, try:
- Enter Recovery.
- Select Mount → connect your phone to a PC.
- Delete unnecessary files (such as heavy videos) through Windows Explorer.
- Reboot the phone and repeat the update.
Unique case: if after upgrading to MIUI 14 Xiaomi Mi 9 requires unlocking the bootloader, although it was previously unlocked, it is a firmware bug.Solution: return to MIUI 13 via Fastboot or wait for a patch from Xiaomi.
Power button problems: alternative ways to turn on
If the power button on Xiaomi Mi 9 broke or does not respond to pressing, you can turn on the phone using alternative methods:
- 🔌 Volume button retention charging: plug in the charger and hold the volume button for 10-15 seconds. In some cases, this triggers the boot.
- 🖥️ PC connection: if the phone is enabled debugging USB (Settings → For developers → Debugging by USB), You can try sending an incorporation command through ADB: adb shell reboot
- 🔄 Automatic turn on schedule: if previously configured the function Auto-include in Settings → Advanced settings → Auto-on/off, the phone can turn on itself at the scheduled time.
If the power button is physically damaged (for example, after a fall), but the phone responds to charging, you can temporarily use it without turning it off. For full repair, you will need to change the button in the service center. The cost of repair in official Xiaomi services is from 1,500 to 2,500 rubles (2026).
⚠️ Warning: If the power button is stuck (constantly pressed), do not try to turn the phone on - this can lead to a short circuit.In this case, immediately remove the battery (in Mi 9 this requires disassembling the case) or take the device to the service.
Frequent Mistakes and How to Avoid Them
When trying to turn on the Xiaomi Mi 9, users often make mistakes that exacerbate the problem.
| Mistake. | Effects of consequences | The right decision |
|---|---|---|
| Using a non-original cable for charging at discharge | The power controller does not recognize charging, the phone does not turn on | Use a cable from the kit or a certified USB-C with Quick Charge support |
| Interrupted updates (cables pulled or power turned off) | Damage to system files, endless download | Wait for the process to be completed (even if it seems frozen) or flash through Fastboot |
| Multiple attempts to turn on with a discharged battery | Deep discharge, battery failure | Connect to charging and wait 30–60 minutes before turning on |
| Reset via Recovery without backup | Loss of all data (photos, contacts, messages) | Try Wipe Cache instead of Wipe Data |
Another common problem is false switching, where the phone vibrates and the screen lights up, but it turns off after a few seconds.
- 🔋 Critical battery discharge (even if the indicator shows 1-2%).
- 🛠️ Firmware damage (reflashing required).
- 🌡️ Overheating or hypothermia (even if the body seems normal).
⚠️ Note: if after switching on the Xiaomi Mi 9 immediately overheats (the body becomes hot in 1-2 minutes), do not use it - it may be a short circuit in the battery.
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Before any firmware manipulation or reset, make sure the battery is at least 50% charged, which will prevent system files from being damaged due to a sudden shutdown.