Launching a smartphone after purchase or prolonged downtime usually does not cause difficulties, but owners of flagship models of the Mi series sometimes face non-obvious situations when the device does not show signs of life. In the case of the Xiaomi Mi 9 Pro, equipped with fast charging and a powerful processor, energy saving algorithms can block the on-line at deep battery discharge. Understanding the physical features of the buttons and logical loading chains MIUI will allow you to diagnose the problem yourself.
First of all, you need to make sure that the device is really charged, as the indicator on the screen may not light up instantly. If you just unpacked the gadget or took it out of the box after a long storage, the first step is to connect to the original power supply with support for the Quick Charge protocol. Often users mistakenly believe that the phone is faulty, although it just takes time to accumulate a minimum charge before the system starts.
In this article, we will take a look at all possible scenarios, from standard on-line to entering special recovery modes that may be required when crashes occur, and learn how to combine volume and power button presses to bring the Mi 9 Pro to life even in critical situations.
Standard first-incorporation procedure
To start a new device or after completely shutting down, use the classic scheme familiar to most Android users. Find on the right side of the case an oval power button that also acts as a fingerprint scanner. Press it and hold it for 3-5 seconds before the Mi logo appears on the display. If the screen remains black, try to increase the pressing force, as the touch button may be inactive until the power is applied.
In some cases, especially if the battery has been completely depleted, the phone can only turn on after connecting the charging cable. 10-15 You can do it for a minute, even if the charging signal doesn't show up right away. MIUI It has built-in protection to prevent starting at critically low battery voltage.
⚠️ Warning: If the phone heats up while trying to turn on, immediately turn off the charger and let it cool.Attempting to start the processor on an overheated battery can cause permanent damage.
Once successfully enabled, you will see a welcome screen where you can select a language and connect to Wi-Fi. At this point, the system may suggest updating the firmware, and it is better to agree to eliminate potential version bugs. The initial setup process takes 5 to 10 minutes depending on the speed of the Internet connection.
☑️ The initial launch of the smartphone
Actions at deep battery discharge
The situation when Xiaomi Mi 9 Pro does not respond to pressing, most often associated with a deep discharge of the lithium-polymer battery. Unlike older models, modern power controllers require a certain time to "rock" the cell. If you left the phone off for a few weeks, standard charging may not give an instant result, and the screen will remain black even when you connect the cable.
Use a charger with a power of at least 18 watts, as Quick Charge 4+ technology can quickly raise the voltage to the operating level. Leave the gadget connected to the network for at least 30-40 minutes without trying to turn it on.
After a waiting period, try a hard reboot, which often helps you get out of a stupor: Hold the power and volume buttons (Power + Vol+) at the same time and hold them for about 15-20 seconds. If the Mi logo flashes on the screen or the Recovery menu appears, then the power controller is alive, and the phone can be started properly.
💡
Use a USB-C cable marked 5A for the fastest “swing” of the fully discharged battery Xiaomi Mi 9 Pro.
Use buttons to log in to Recovery and Fastboot
If standard activation is not possible or you need to reset settings, you need to use key combinations to enter special boot modes. These tools are built into the device booter and are available even when the operating system is damaged. To log into the Recovery menu, designed for reset or flash, turn off the phone (if it is on) and press the power button along with the volume button.
Hold both buttons until the logo appears, then release the power button while still holding the volume. You will see a multi-point menu controlled by volume buttons and power button confirmation. Here you can choose Wipe Data for full reset or Reboot for normal start-up. Be careful: selecting Wipe All Data will remove all information from the device without recovery.
To enter the Fastboot mode required to connect to your computer and run through the Mi Flash Tool, another combination is used: Turn off the smartphone completely, then simultaneously press the power button and the volume button (Power + Vol-).
| Regime. | Keyboard combination | Appointment | Screen indication |
|---|---|---|---|
| Recovery | Power + Volume Up | Reset, flashing. | Menu with orange/blue background |
| Fastboot | Power + Volume Down | Firmware through PC | The android hare |
| Safe Mode | Retention Vol- during loading | Diagnostics of applications | It says "Safe Mode." |
What to do if the buttons do not respond?
Problems with the power button and their solution
One of the specific problems of some Xiaomi Mi 9 Pro instances is sticking or failing the power button, which is combined with the fingerprint scanner. Mechanical wear or moisture can cause the contact to not close and the phone cannot be turned on in the usual way. In such cases, the method of short-term connection to the charger helps: some versions of MIUI allow you to turn on the phone with a long connection of the USB cable when turned off.
If the button is physically functional but software-locked, massage the scanner area. Intensely, but without fanaticism, press the power button area for 10-15 seconds, then try the standard switch. It's also worth checking if you have a case that pushes too hard on the side face, blocking the key's movement.
⚠️ Note: Do not use sharp metal objects to press the button, so as not to damage the moisture-retarding membrane or the scanner mechanism itself.
If the hardware is completely malfunctioning, the only solution is to replace the power button plume in the service center, but before visiting the workshop, you can try connecting the phone to the computer: if the PC makes a connection sound USB-The device, therefore, the motherboard is alive, and the problem is only in the mechanism of the button.
Diagnostics through PC Connection
Connecting a smartphone to a computer is a great way to diagnose when the screen is not lit. If when you connect a USB cable to a PC port, new hardware appears in Windows Device Manager (for example, QDLoader 9008 or Android Bootloader Interface), this indicates that the processor and memory are functioning. EDL (Emergency Download) mode indicates a critical firmware failure that requires flashing through special utilities.
Use the original cable to check, because cheap analogs can only charge without transmitting data. Open the Device Manager on your computer, plug the phone off and press the switch on button. If new positions appear and disappear in the list of devices, then the phone responds to the on command, but can not display the image.
Sometimes it helps to install Xiaomi USB Driver manually. After installing the drivers, plug your phone in and try sending a command to turn on via ADB (if debugging was previously enabled). the adb reboot command can force the system to start bypassing the physical button.
adb devices
adb rebootRecovery after a failed firmware
If the phone stopped turning on after trying to install custom firmware or obtain root permissions, most likely, the system partition is damaged. In this case, standard on is not possible and you need to log in to Recovery mode. If the standard menu does not open, then the recovery partition may also be damaged, then only the Fastboot mode and the Mi Flash Tool program will help.
Download the official firmware for your regional version (Global, China, EU) In Fastboot mode, connect your phone to your PC and start the script. flash_all.bat. This process will completely re-write the memory of the device, returning it to the factory state. USB-port, preferably on the back of the system unit.
⚠️ Warning: Fastboot flashing completely removes all data from internal memory. If you didn't have a backup, you can't restore photos and contacts.
Once the firmware is successfully installed, the phone will automatically restart. It can take up to 10 minutes to launch the first time, as the system optimizes applications. If the reboot cycle is repeated, it may be a hardware problem, such as a display plume has gone away or a memory module has been damaged.
💡
The most reliable way to bring your phone back to life after software failures is to flash it through Fastboot with complete data erasure.