Xiaomi’s modern smartphones accumulate vast amounts of data, from personal photos and instant messengers to passwords for banking applications and browser history. Before selling a device, transferring it to another user or if necessary deep cleaning the system, it is critical to perform a qualitative deletion of all personal information. Simply moving files to the basket is not enough, since modern methods of data recovery allow you to extract remote content.
The process of completely cleaning the Android shell MIUI or the new HyperOS requires a consistent approach. Not only do you need to erase user files, but also untie the device from the cloud services so that the new owner does not face an activation lock. In this article, we will discuss all the stages of preparation, manual removal methods and hardware reset via Recovery mode.
Many users underestimate the importance of pre-preparation, which often leads to loss of access to accounts or locking the device over IMEI. The right sequence of actions ensures that your data does not fall into the wrong hands, and the phone is ready for a clean installation of the operating system by the new owner. Let's look at a detailed algorithm of actions.
Device preparation and backup
Before you start radical measures to delete information, you need to back up all the important data. Built-in system allows you to save contacts, call logs, SMS messages and even desktop layout. Go to Settings → About Phone → Backup recovery and create a backup to a memory card or external drive.
Special attention should be paid to synchronization with cloud services, make sure that your photos are uploaded to Google Photos or Mi Cloud, and contacts are saved to a Google profile, this will quickly restore the necessary information on the new device, and it is also recommended to check the download folders and documents that are often left out of automatic sync.
For users who value maximum security, there is the option of encrypting data before resetting. Although modern versions of Android encrypt data by default, additional verification of security settings will not hurt. Make sure that the device has a reliable method of locking the screen, which will be deleted only during the final reset.
☑️ Preparation for data deletion
So the backup phase is fundamental. If you're planning to sell your phone, it's also worth recording or photographing the settings of important apps so you don't re-set them on a new gadget.
Unbinding Google and Mi Accounts
The most critical step that is often overlooked is logging out. Android has Factory Reset Protection (FRP), and if you reset your settings without deleting your Google account, your phone will ask for the password from that account when you first activate it, and without the password, the device will become a brick.
To unbundle your Google account, go to Settings → Accounts & Sync → Google. Select your profile and click Delete Account. A similar procedure is required for Mi Account. From Settings → Mi Account, click Log Out. The system can request a password to confirm the transaction.
⚠️ Note: If you forget to log out of your Mi Account before resetting, your phone may be blocked by the Find Device function, which can only be unlocked through Xiaomi’s official website by providing a check of purchase, which is often impossible when selling with hands.
Once accounts are deleted, it is recommended to check the list of trusted devices in your Google profile security settings through your browser on your computer. Remove the current smartphone from there to break all active sessions and accesses. This ensures that even in the event of a crash, remote access to your data will be closed.
Two-factor authentication applications, such as bank clients and instant messengers, are worth special attention, and before cleaning, it is better to log out manually or make sure you have access to your phone number for re-authorization. Some banking applications require a complete reinstallation and re-assignment when you change devices.
What is FRP Lock?
Manual deletion of files and memory cleaning
Although a full reset deletes most data, manually checking file storage is sometimes necessary for complete certainty: Use the built-in Explorer or Files app to check internal folders. Pay special attention to messenger directories such as WhatsApp or Telegram where media files may remain.
For deep cleaning, you can use the Cleanup function in the Security app, which will find the application cache, residual files and advertising debris. However, to delete personal data, you better go through the Settings → Storage path and manually check the amount occupied by each application. If necessary, clean the data of specific programs through the application management menu.
- 📸 Gallery: Check out the “Recently Deleted” folders and screenshot albums that often contain sensitive information.
- 💬 Messengers: In the settings of each messenger, use the “Clear all chats” function before removing the application itself.
- 🌐 Browsers: Clear history, cookies and saved passwords in Chrome or Mi Browser settings.
- 📁 Download: The Download folder often contains copies of documents that need to be manually deleted.
After manual cleaning, it is recommended to restart the device, which will allow the system to update the file indexes and free up space. If you use a microSD card, it is better to remove it before the final reset or format it as internal storage if this option was active so that the data does not remain on the media.
Complete reset via system settings
This is the main and most secure method of deleting information for most users, it allows you to delete all data, keeping the integrity of the operating system. Before you start, make sure that the battery is charged at least 50-60%, as the process can take from 10 to 30 minutes depending on the amount of memory.
To start the procedure, go to the Settings menu → The phone. → Reset. At the bottom of the screen, you'll see a button called "Erase all data." The system will alert you that all files, applications and settings will be deleted. PIN-a code or pattern lock, it will need to be entered to confirm.
Some versions of MIUI may require you to enter a password from your Mi Account even after you log out, as an additional security measure. This is normal. Once confirmed, the deletion process begins, the phone reboots, and you see the download logo with a progress indicator, and it is strictly forbidden to interrupt this process.
| Action. | The result | Risks. |
|---|---|---|
| Reset via settings | Delete data completely, phone as new | Minimum if the battery is charged |
| Deletion of accounts | Removing FRP lockdown | Locking the device when omitted |
| Hand cleaning | Deletion of visible files | Data recovery is possible |
| Reset via Recovery | Deep cleaning when blocking | It requires a precise hit on the menu. |
Once the reset is complete, the phone will turn on in its initial setup mode, suggesting you choose a language and connect to Wi-Fi. If you see this screen, it's a success, and the information is deleted. You can turn off the device and it's ready to be handed over to the new owner.
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Resetting via the settings menu is the only method that ensures that all partitions of memory are properly deleted without the risk of damaging the system firmware files.
Hardware reset via Recovery mode
If you can't access the settings menu because of a forgotten password or system failure, Recovery mode is also effective for deleting information, but requires caution.
Press both the Volume Up and Power button at the same time. Hold them until the Mi logo appears, then release the power button, continuing to hold the volume until the Main Menu menu appears. Navigation is done with volume buttons, and selection is done with the power button.
From the menu, select Wipe Data, then Wipe All Data. The system will ask for confirmation — select Confirm. Once you complete the process, select Back to Main Menu and then Reboot → Reboot to System. The phone will restart and begin cleaning.
⚠️ Recovery Resets Don’t Always Remove Google Protection FRP. If the phone was linked to an account, it will still require you to enter the password from the last synchronized Google account after turning on.
Recovery mode is useful when the system interface is not responding or locked. In a normal situation, when you are just selling a phone, it is better to use software reset via settings, as it correctly handles the unbundling of accounts.
Checking the results and final actions
Once the phone has rebooted and you've seen the welcome screen, don't rush to give it back. Check if it's requested accounts. If the phone is clean and suggests you choose the language, it's a success. It's also worth checking if there's any information left on the memory card if you forgot to retrieve it.
If you sell a device, it is recommended that you don't set it up to the end (don't connect the new owner to Wi-Fi), but just turn it off, which will allow the buyer to go through the initial setup, and you should put a brief instruction in the box or tell the buyer that the phone is completely cleaned.
For maximum privacy, some experts recommend that after the first reset, fill the phone’s memory with unnecessary large files (video, archives), and then reset it again, which will make it difficult to restore old data using forensic methods, as new data will overwrite the memory sectors where your information was stored.
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For maximum security, you can reset your data once, download a few gigabytes of useless files (like movies) to your phone, and then reset it again, making it almost impossible to recover your old data.