Xiaomi Mi smartphones are known for their high performance, but over time, even flagship models like the Xiaomi Mi 9 can face slowdowns, software bugs, or system partition overflows. Formatting a device is a radical but often the only effective way to return the gadget to factory speed and stability. This procedure completely clears internal memory, removing all user data, app cache and system debris that could have accumulated over the years of operation.
Before you start taking action, you need to clearly understand the difference between a normal reset and deep formatting. In the context of Android devices, formatting is most often meant Hard Reset, which returns the software to its original state. This is not just deleting files, but completely reinstalling system configurations. If your Xiaomi Mi 9 began to behave unpredictable, quickly discharge or freeze, this article will be a comprehensive guide to solving the problem.
It is worth noting that the process of restoring factory settings on the MIUI shell has its own features that differ from pure Android. Wrong actions can lead to the loss of important data or, in rare cases, to lock the device with a Mi Account.
Xiaomi Mi 9 Preparation for Full Reset
The first and most critical step is to save your personal information. Once you start the formatting procedure, all photos, contacts, messages and installed applications will be permanently deleted. It is recommended to use the built-in MIUI backup feature, which allows you to save data to your computer or to the Mi Cloud cloud storage. You can also use third-party tools, such as Google Drive, to synchronize contacts and calendar.
The second important aspect is battery charge: the process of overwriting system partitions and formatting user memory requires stable power. If the battery runs out at a critical moment, the file system may be damaged, which will lead to the inability to load the operating system. Make sure that the charge level is at least 60-70%, and ideally connect the device to the charger during the operation.
Don't forget to unplug your accounts. Modern versions of Android and MIUI have anti-theft protection, and if you just format your phone, the next time you activate it, it will require you to enter a password from a Google account or Mi Account that was previously linked, and if you don't remember that, it will turn into a brick.
- 🔋 Charge your smartphone to at least 70% for process stability.
- 💾 Backup all important files on your PC or in the cloud.
- 🔓 Remember the passwords of Google and Mi accounts linked to your phone.
- 📱 Extract. SIM-MicroSD card and memory card before work.
⚠️ Attention: Removing the microSD card is critical. If you format your internal memory by selecting the "Clear All" option, the system may suggest formatting and SD-the card as an internal storage, which will lead to the loss of data on it.
☑️ Ready to dump
Method 1: Reset via system settings (Soft Reset)
The safest and easiest method available to every user is to use a regular settings menu, which is suitable for cases where the smartphone is turned on, the screen responds to touch, and you can freely navigate the interface. The MIUI shell algorithm is quite logical, but requires careful consideration when choosing cleaning options.
To start, open the Settings app and scroll down to the bottom of the About Phone section, which contains all the information about your device, including the CPU version, RAM, and most importantly for us, the Reset button, and clicking on it will take you to the menu, where the system will offer two options: Reset (without deleting data) and Erase all data (full formatting).
The second option we're interested in is that the system will alert you that all data will be deleted, and ask you to enter the screen unlock password or the pattern lock, which is a security measure so that the attacker can't reset the stolen phone, and once confirmed, the cleanup process will begin, which will take 5 to 15 minutes depending on the amount of memory filled.
What happens when you choose “Reset Settings”?
It's important to keep the process going. Even if it looks like the phone is getting stuck on the MI logo or bar, don't try to turn it off with buttons. Internally, the formatting of /data and /cache partitions takes time.
Method 2: Formatting with Recovery Mode (Hard Reset)
If the smartphone does not turn on, freezes on the logo or the touch screen does not respond, the only way out is to use Recovery Mode Recovery Mode. This method is deeper and allows you to reset even in the event of serious software failures.
To get into the Recovery menu on the Xiaomi Mi 9, you need to turn off your smartphone completely. Then simultaneously press the Volume Up and Power button. Keep them clamped until the Mi logo appears, then release the power button, but continue to hold the volume button until the main Recovery menu appears.
From the Recovery menu, select a language (usually English or Chinese), then go to Wipe Data, and you will be asked to select Wipe All Data. Confirm the action and the system will start formatting. This process completely clears the user partition, leaving only a clean operating system.
| Parameter | Soft Reset (Menu) | Hard Reset (Recovery) |
|---|---|---|
| Access to the OS is required | Yes. | No. |
| Sensor work | Required. | Not required |
| Difficulty | Low. | Medium |
| Risk of error | Minimum | Medium. |
⚠️ Warning: In Recovery mode, the touch screen is not working. Use volume buttons to move the cursor (up/down) and the on button to confirm the selection (analogue Enter).
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If the Recovery menu is in Chinese, select the top item, then the second one on top is the English menu entry.
Using the Mi Flash Tool for deep cleaning
For advanced users who are faced with critical system errors that are not fixed by standard methods, there is a tool Mi Flash Tool. This is the official tool from Xiaomi for firmware devices through the computer, which allows you not only to format your phone, but also completely rewrite all system partitions, including the bootloader and recavers.
To work with Mi Flash Tool you will need a PC with Windows OS, USB-High quality cable and pre-downloaded stock firmware for Xiaomi Mi 9 (codename cepheus). It is important to download the firmware version that matches the region of your device, or the global version if you plan to change region. The process requires the transfer of the smartphone to Fastboot mode (clamping the volume and power button when the phone is turned off).
In the interface, you have to choose the path to the folder with the unpacked firmware. The key here is to choose the firmware mode at the bottom of the window. To fully format and clean all data, you have to choose the clean all option, which command will force all data to be erased and the clean system installed.
fastboot flash system system.img
fastboot flash userdata userdata.imgUsing the Mi Flash Tool gives you the most control over the process, but requires technical literacy. Mistake in choosing a firmware file or mode can lead to the failure of the device.
Typical problems and their solution
During the formatting process, users of Xiaomi Mi 9 can face a number of specific problems. One of the most common is the endless restart (bootloop) after a reset. This can occur due to damage to system files or conflicting versions of Android. In such cases, re-resetting through Recovery often helps with the selection of the Wipe All Data item twice in a row.
Another common problem is that you need to activate after you reset, and if the phone says, "This device is locked to Mi Account," it means that the theft protection is working, and without the password from the account that was synced before the reset, you can't use the phone, and it's not a bug, it's a security feature.
It is also possible to hang on the Mi logo for a long time (up to 10-15 minutes).In the case of the Xiaomi Mi 9, which is equipped with a fast UFS drive, the first launch after formatting really takes longer, as the system optimizes applications and creates new caches.
- 🔄 Infinite Reboot: Try Recovery Reset Again.
- 🔒 Account Request: Enter data that was previously used on this device.
- ⏳ Long load: (wait) up to 20 minutes without turning off the phone.
- 🔥 Overheating: the first setup processor works at maximum, it is normal.
Primary configuration after formatting
Once the formatting process is successfully completed, the smartphone will restart and greet you with a language selection screen, a step that is familiar to anyone who has ever used Android, but MIUI has its nuances. The system may suggest recovering data from a cloud copy of Mi Cloud or Google. If you did a backup, this is the perfect moment to use it.
Be sure to check for system updates immediately after setting up. Since you may have dropped your phone on an older firmware version (if you haven't updated for a long time), current security patches will fix vulnerabilities and improve stability. Go to Settings → About Phone → System Update.
Don’t install all the apps at once. Let the system warm up for an hour without active load, which will allow MIUI background services to correctly index files and adjust battery life, which is especially important for the Xiaomi Mi 9 lithium polymer battery.
⚠️ Note: Do not ignore security setting steps, such as installation PIN-After formatting, the old biometrics are erased and need to be re-registered.
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Proper initial configuration and software updates immediately after reset guarantee maximum performance and autonomy of the smartphone in the future.