How to turn Xiaomi 12 on: From Basic Startup to System Recovery

Xiaomi 12 is the flagship of 2022 with a powerful Snapdragon 8 Gen 1, but even such a device may not turn on. The reasons range from a dead battery to software failures after an update. In this article, we will analyze all possible scenarios from standard onset to recovery via Fastboot and Recovery.

It's important to understand that the algorithm of actions depends on the response of the device, and if the screen is completely black, this is one case, if the Mi logo burns and then the download does not go on, another, and we will look at each option with step-by-step instructions, warnings about typical errors and tips for diagnosing malfunctions.

This article will be useful for both beginners and experienced users. For the first, we have detailed the basic steps, for the second, we have added advanced methods using ADB and service modes. All instructions are tested on Xiaomi 12 (codename cupid) with MIUI 13/14 and HyperOS firmware.

Standard on: Power button and charging

Start with the simplest — check if the battery is not discharged. Even if you are sure that you charged the smartphone the day before, the battery could run out in the background due to active applications or a failure of the power controller.

Connect the Xiaomi 12 to the original charger (at least 33W) and wait 10-15 minutes. In a deep discharge, the charging indicator may not light up immediately. If the screen remains black after 20 minutes, try another charger or cable - the problem may be contacts.

After connection to charging:

🔄 Press and hold the power button for 10-15 seconds until the Mi logo appears.
🔋 If the screen is still black, but you press the power button, you feel a slight vibration, and the battery is charged. Wait another 30 minutes and try again.
🔌 Try connecting your smartphone to another power source (for example, to a computer via a computer). USB). Sometimes it helps to change the type of connection.

If the smartphone is responding to charging (the indicator lights up) but does not turn on, the problem may be a software failure, in which case, move to the next section on forced reboot.

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Use only original or certified USB-C cables from Xiaomi. Cheap analogues may not provide enough current to charge a discharged battery.

Forced Reset (Hard Reset)

If the Xiaomi 12 is getting stuck on the Mi logo or the screen is flashing but the boot is not finished, a forced reboot will help.This method does not delete data, but simply restarts the system.

To perform Hard Reset:

Hold the power button and the volume button at the same time.
After 8-10 seconds, the device vibrates and restarts.
Release the buttons when the Mi logo appears on the screen.

If the smartphone is stuck on the logo again, repeat the procedure 2-3 times. Sometimes the system "wakes up" after a few reboots. If this does not help, the problem is deeper, and you will need to log in to Recovery Mode.

Make sure the battery is at least 10% charged | Turn off all cables (charging, headphones) | Press the buttons with force - sometimes contacts are oxidized | Try 2-3 times at 1 minute intervals

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⚠️ Warning: Don't confuse Hard Reset with Factory Reset. The first method is data-safe, the second one deletes everything from internal memory.

Log in Recovery Mode and reset settings

If the smartphone is turned on but not loaded beyond the logo, or cyclically restarted (bootloop), you will need to log in to Recovery Mode. This mode allows you to reset settings, clear the cache or install the update manually.

To enter Recovery:

Turn off your smartphone (if it is on, hold the power button until vibration occurs).
Press the power button and the volume button.
When the Mi logo appears on the screen, release the power button, but continue to hold the volume button.
In 3-5 seconds, you will see the Recovery menu in English or Chinese.

In the Recovery menu, use volume buttons for navigation and power button for confirmation.

🔄 Reboot - a normal reboot.
🧹 Wipe Data – Complete reset (deletes all data!).
🗑️ Wipe Cache – Cache Clearance (Secure for Data).
📦 Apply update – installing updates with SD-card ADB.

Try clearing the cache first. If that doesn't work, reset to the factory settings (Wipe Data), but note that all data will be deleted. After reset, the smartphone can take a long time to boot (up to 10 minutes) - do not interrupt the process!

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Recovery through Fastboot Mode

If Xiaomi 12 doesn’t respond to buttons or Recovery doesn’t have the right option, Fastboot mode will help.It lets you reflash the device through your computer even if the system doesn’t boot.

For entrance to Fastboot:

Turn off the smartphone (if necessary, remove and insert back the battery if it is removable).
Press the power button and the volume down button.
Hold them until the screen with the image of a hare in a hat-eared (Fastboot Mode) appears.

Further actions require a computer with installed Xiaomi drivers and the Mi Flash Tool utility.

Download the official firmware for Xiaomi 12 (codename cupid) from MIUI Downloads.
Unpack the archive with firmware in a folder without Cyrillic characters.
Connect your smartphone to your computer via USB-C.
Launch the Mi Flash Tool, select the firmware folder and press Refresh – the device must be determined.
Select firmware mode: Clean All - complete clean (deletes all data); Clean All and Lock - clean + lock bootloader (for official firmware); Save User Data - data storage (does not always work when crashes).

Flash

⚠️ Note: Firmware via Fastboot can lead to device lock if you use unofficial software or the mode is not selected correctly.Always check the model firmware compliance (cupid for Xiaomi 12).

Firmware mode	Data retention	Requires unlocking of the loader	Recommended case
Clean All	❌ No.	❌ No.	Critical glitches, bootloop
Clean All and Lock	❌ No.	❌ No (blocks the loader)	Restoration of official firmware
Save User Data	✅ Yes.	✅ Yes (if the bootloader is unlocked)	Minor crashes, updates

Diagnostics of hardware faults

If none of the software methods worked, the problem could be the hardware, common malfunctions of Xiaomi 12, which make it impossible to turn on:

🔋 Faulty battery: bloating, deep discharge, or contact dump. Check if the case is deformed.
🔌 Damaged charging connector – oxidation, break of contacts or mechanical damage.
🛠️ Display plume dump or power button – often occurs after falls.
🔥 Failure of the power controller – the smartphone does not respond to charging or buttons.

For self-diagnosis:

Light a flashlight on a screen in a dark room – if the image is barely noticeable, the problem is in the backlight or plume.
Connect your smartphone to your computer – if it is defined as a Qualcomm HS-USB QDLoader 9008, it is a sign of hard brick (requires firmware via EDL Mode).
Check if the device warms up when you connect to the charger. If so, maybe it's charging, but the screen is not working.

⚠️ Warning: If your smartphone falls into the water or is hit hard, don't try to turn it on.A short circuit can damage the motherboard.

What if Xiaomi 12 is defined as QDLoader 9008?

This is EDL (Emergency Download Mode) mode, which indicates a critical bootloader error. To restore you will need: 1. Mi Flash Tool with EDL. 2. Official firmware for your model. 3. Authorized Xiaomi account (for new devices). The firmware in this mode deletes all data and can lock the device if errors.

Prevention of inclusion problems

To avoid situations where Xiaomi 12 refuses to turn on, follow the simple rules:

🔋 Avoid deep battery discharge (below 5%) and charge your device regularly.
🔄 Update the firmware through Settings → The phone. → System updates: Failures often occur on legacy versions MIUI.
🛡️ Install apps only from Google Play or Mi App Store. APK They may contain malicious code.
🔌 Use original charging accessories. Cheap cables and adapters damage the power controller.

We also recommend:

Once a month, clean the cache through Recovery (does not delete data, but eliminates small lags).
Disable battery optimization for mission-critical applications (e.g. messengers) in Settings → Battery.
Avoid overheating – Do not leave your smartphone under direct sunlight or on charging near heat sources.

If your smartphone starts to “glutch” (spontaneous reboots, brakes), back up your data through Settings → Additional → Backup and Reset. This will help you quickly recover information after reset.

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Regular firmware updates and the use of original accessories reduce the risk of hardware and software failures by 70%.

Frequently asked questions

The smartphone vibrates when you press the power button, but the screen is black. What do you do?

This is a sign that the device is powered but can't initialize the display. Possible reasons: Screen plume collapse (removal required); backlight failure (check the screen with a flashlight); graphics driver failure (fastboot firmware will help); If you're not good at repairing, contact the service. Self-defying the Xiaomi 12 can damage the flexible plumes.

After the MIUI update, the smartphone doesn't turn on. How do you roll back?

If the update led to bootloop, try: Clear cache via Recovery (Wipe Cache). Install the previous firmware version via Fastboot (download it from Xiaomi Firmware Updater). If the bootloader is locked, rollback is only possible through the Mi Flash Tool with the Clean All and Lock option option option option option option option selected. ⚠️ Firmware rollback can result in device lock if Anti-Rollback rules are violated.

Can I turn on Xiaomi 12 without a power button?

Yes, there are several ways: Connect your smartphone to charge — sometimes it turns on automatically when a certain level of charge is reached. Use ADB (if USB debugging is enabled): adb shell reboot If the power button is mechanically damaged, you will need to replace it in the service.

The smartphone turns on, but it turns off. What's the matter?

Causes: Critical battery discharge (even if the indicator shows charge); short circuit on the board (after falling or getting moisture); failure of the power controller (requires diagnostics in the service); try to connect the smartphone to charging for 1-2 hours, then perform Hard Reset. If it does not help, carry it for repair.

How to check if the battery is burned?

Signs of a faulty battery: The smartphone only turns on when charging, but turns off when disconnected. The battery is swollen (as seen by the deformation of the case or screen). The device warms up strongly when charging. The Recovery or Fastboot displays a Battery low error even after a long charge. The only solution is to replace the battery. On Xiaomi 12, it is a laborious process due to the adhesive mounting.