Why Xiaomi Mi 9 is not included: a complete guide to diagnostics and repair

Xiaomi Mi 9 is the flagship of 2019, which is still popular among users due to its powerful hardware and affordable price. But even reliable devices sometimes refuse to turn on, leaving owners confused. If your smartphone does not respond to the power button, does not show signs of life when charging or hangs on the logo, do not rush to carry it to the service center. In 70% of cases, the problem can be solved by yourself without special skills.

In this article, we’ll look at all the possible reasons why the Xiaomi Mi 9 doesn’t turn on, from the usual battery drain to serious hardware breakdowns, how to distinguish a “soft” failure from a critical one, what manipulations you can do at home, and when to contact professionals, and we’ll also provide checklists for diagnostics, charger compatibility tables and step-by-step instructions for restoring performance.

Important: Action algorithms for Mi 9 and Mi 9 SE This may differ due to different processors (Snapdragon 855 vs Snapdragon 712.

1.Primary diagnosis: what to do if the phone does not show signs of life

Before you panic, make sure the problem is serious, start with basic checks, which take no more than 5 minutes, but help to rule out 30% of false positives.

Step 1. Checking the charging

• 🔌 Connect the original cable and power supply (power at least) 18W). Mi 9 Supports Quick Charge 4+, But for diagnosis, any charger with an exit will do. 5V/2A.
• ⏳ Leave your phone on charge for at least 30 minutes. Even if the indicator doesn't burn, the battery could run out of power.
• 🔄 Try another charger or USB-Some of the problems are caused by damaged cables.

Step 2: Forced reset

On Xiaomi Mi 9, you can reset the suspended system with a combination of buttons:

Hold [Eating] + [Loudness Increase] 10-15 seconds

If the phone vibrates or the logo appears, it's a software problem. If there's no response, move on to the next step.

Step 3: Visual examination

• 🔍 Check the charging connector for debris, oxidation or mechanical damage.
• 💧 Check the case for traces of moisture (even if the phone did not sink, the condensate could damage the board).
• 🔋 If the battery is removable (it is non-removable in the Mi 9, but some users change it themselves), make sure it is properly connected.

2. Software glitches: how to recover your phone without losing data

If Xiaomi Mi 9 vibrates when you press buttons, but does not load beyond the logo or hovers on the screen MIUI, The reason is probably software. Let's look at ways to go from the safest to the radical.

Method 1. Download to Safe Mode (Safe Mode)

Safe Mode allows you to start a phone with third-party apps disabled, and if the problem is caused by a virus or a program conflict, in this mode the phone should boot.

If the phone has booted, remove the recently installed apps through Settings. → If not, move on to the next method.

Method 2: Resetting through Recovery Mode

Recovery does not delete user data, but resets system settings. For Mi 9, use the combination:

1. Turn off the phone.


2. Hold [Nutrition] + [Low up] until the Recovery menu appears.




3. Select Wipe Data → Wipe All Data (use volume buttons for navigation, power for confirmation).




4. Reset the device.

⚠️ Note: If the phone has been locked with a pattern lock or PIN-code, after reset via Recovery, you will need to enter the Mi Account information!

Method 3: Fastboot Flashing

If the previous methods didn't work, the radical option is to run the firmware on Fastboot, which will delete all the data, but bring the phone back to life.

• 🖥️ Computer with Qualcomm drivers and Mi Flash Tool.
• 📁 Official firmware for Mi 9 (download only from Xiaomi Firmware website).
• 🔌 Original. USB-cable (better from the set).

3. Hardware malfunctions: when without repairs can not do

If the software methods didn’t work, the problem lies in the “hardware” Xiaomi Mi 9 has several typical hardware weaknesses that lead to power failure.

Reason 1: Failed battery

Battery Mi 9 (model) BM4B) Prone to swelling after 2-3 years of operation, especially when using non-original chargers:

• 🔋 The phone is turned on only when the cable is connected, but turns off immediately after disconnection.
• 🔥 The case is deformed (blown is noticeable if you put the phone down on a flat surface with a screen).
• ⚡ Charging is jerking or interrupted.

Solution: battery replacement, original battery cost from 1,500. ₽, Replacement work – from 1000 ₽. Do not use cheap analogues: they can damage the power controller.

Reason 2: Damage to the power controller

Controller (PMIC) It's responsible for distributing the energy from the battery to the components of the phone, and it often fails after the battery is powered:

• ⚡ Use “fast” charging from other brands (especially Samsung or Huawei).
• 💦 Moisture intrusion (even if the phone hasn’t sunk, high humidity can cause corrosion).
• 🔌 Sharp voltage surges (for example, charging from an unstable socket).

Diagnosis: if the phone does not respond to charging, but when connected to a PC is defined as Qualcomm HS-USB QDLoader 9008 - Controller damaged, repair is only possible in the service center (cost from 3000) ₽).

Reason 3: Drap or damage to plumes

The Mi 9 has two critical plumes:

1. The display plume (often departs after falls).
2. The power button plume (wears out over time).

Signs: the phone vibrates when charging, but the screen remains black, or the power button works "once again." ₽).

⚠️ Warning: If you disassembled the phone yourself, check if there are metal particles (such as a screwdriver) inside the phone, which can close the contacts on the board, causing the device to fail completely.

4. Problems after the update: how to roll back firmware

One of the most common reasons for the “brick” Xiaomi Mi 9 – a failed update MIUI. It could be because of:

• 📥 Interrupted loading OTA (For example, if the battery is running out during the upgrade).
• 🔄 Version conflict (e.g. trying to install firmware for Mi 9) SE on Mi 9).
• 🛠️ «Custom firmware (unofficial builds often contain errors).

How to roll back firmware without losing data

If the phone is switched on but is not working properly:

1. Go to Settings → About the phone → System update.
2. Click on the icon «⋮» (three dots) in the upper right corner and select Select Service Package.
3. Download the stable version from Xiaomi website MIUI For your model and choose it manually.

If the phone doesn't turn on

Use Fastboot to install the previous firmware version. Download the archive with the desired version (for example, download the archive with the desired version, MIUI 12.5 instead of problem MIUI 14) and follow the instructions in section 2.

💡

Before you run your firmware, check the bootloader version! if it is blocked, you will need an official unlocker from Xiaomi (the process takes up to 72 hours).

5. Recovery after moisture is injected

Xiaomi Mi 9 doesn’t have official protection by standard IP68, It can withstand short-term moisture, but prolonged contact with water or steam can cause contact corrosion.

What to do immediately after getting moisture:

What NOT to do:

• 🔥 Dry with a hair dryer (hot air will damage the screen and battery).
• 🍚 Put in rice or other absorbents (particles can get inside).
• ⚡ Connect to a charging or PC (short circuit risk).

Signs of damage after drying:

• 📵 No network (antenna module damaged).
• 🔊 Distorted sound in speakers or microphone.
• 🔋 Fast battery discharge (corrosion of the power controller).

If the phone does not turn on after drying, disassemble it (or take it to the service) and check:

• 🔋 Battery contacts for oxidation (cleaned with alcohol).
• 📶 Antenna tracks (often corroded first).
• 🔌 Charging connector (check for green plaque).

💡

If the phone is turned on after moisture is injected, but it is unstable, back up the data as soon as possible. Corrosion can occur in a few days or weeks.

6. When to contact the service center

Not all breakdowns can be repaired by yourself.

• 🔧 The phone does not respond to any of the described manipulations.
• 💥 On the board, traces of burns or bloated capacitors are visible.
• 🔋 Battery swelling (risk of fire!).
• 📱 The screen crashed and the sensor was not working (display replacement needed) + plume-check).

How to choose a service center

Average prices for repairs Xiaomi Mi 9 (2026):

• 🔋 Battery replacement: 1500–2500 ₽.
• 📱 Display replacement (original): 6000-8000 ₽.
• 🔌 Repair of the power controller: 3000–5000 ₽.
• 💧 Cleaning after moisture: 2000–4000 ₽.

⚠️ Warning: If the phone is warranty, don't disassemble it yourself! Opening the case will void Xiaomi's warranty obligations. Contact the official service center with a check and a box.

7 Prevention: How to avoid problems in the future

To make Xiaomi Mi 9 last longer without failure, follow these recommendations:

Charging and battery

• 🔌 Use only original or certified chargers (Quick Charge) 3.0/4+).
• 🔋 Do not allow a discharge below 10% and a charge above 90% (optimal range for lithium polymer batteries).
• 🌡️ Avoid overheating (do not leave your phone in the sun or near heat sources).

PO Updates

• 📥 Updates only to stable Wi-Fi (not mobile).
• 🔄 Before updating, make a backup through Settings → Additionally. → Backup.
• ⚠️ Do not install custom firmware unless you are sure of their compatibility.

Mechanical protection

• 🛡️ Use a cover and a protective glass (even if the phone is in your pocket).
• 💧 Avoid high humidity (do not take your phone to the bath or pool).
• 🚫 Do not put your phone in the back pocket of jeans (risk of breaking when you fit the jeans).

💡

Clean the dust charger once every 3 months with a wooden toothpick. The dirt that has been picked up can disrupt contact and cause power problems.

FAQ: Frequent questions about Xiaomi Mi malfunctions 9