How to delete all data from Xiaomi smartphone before selling

Selling or transferring Xiaomi to another user requires a responsible approach to the issue of privacy. In the memory of a modern smartphone, hundreds of megabytes of personal information are stored, from photos and correspondence in instant messengers to saved passwords of banking applications and access keys. Simply deleting files through a file manager is not enough, because modern technologies allow you to recover remote information with special utilities.

The process of completely cleaning a Redmi or Poco device involves not only a standard reset, but also pre-prepared system. Ignoring the decoupling steps of accounts can lead to the fact that the new owner simply can not start the phone due to the activation lock. Below is a detailed step-by-step guide to help you secure your digital assets.

It's important to understand that once you've done the final steps, you can't restore access to your data without having a backup. The pre-reset encryption process is a critical step for devices running Android versions below 10, because it makes it impossible to recover information even theoretically. Let's take each step as closely as possible to eliminate any leakage risks.

Preparation of backup and verification of cloud services

Before you start any manipulation of system files, you need to make sure that all important data is stored in a safe place. Xiaomi ecosystem users often neglect to check sync, relying on automatic processes that may have failed. First of all, open the Security application and go to the cloud services section to check the status of downloading contacts, notes and voice recordings.

Photos and videos are the most memory-consuming, so it’s worth keeping them safe. If you use Google Photos, make sure all albums are marked with a cloud icon, not a download arrow. For those who prefer local storage, the best solution is to connect the device to the computer through the Internet. USB-cable DCIM Pictures on an external hard drive.

• 📸 Check the sync status of the gallery in the Google Photos or Mi Cloud app.
• 📞 Export your call history and SMS-Messages through built-in system tools.
• 📝 Save files from Downloads folder and documents from office applications.
• 🔐 Copy two-factor authentication codes if stored in the Authenticator app.

⚠️ Warning: Before selling, make sure you remember the password from your Mi Account and Google account. Upon reset, the phone will require you to enter the last authorized user's details to confirm ownership.

Remember to keep contact lists that are often stored only in memory. SIM-Go to the Contacts app, select settings, and export all the records to a.vcf file, save it to your computer or send it to your email. It only takes a few minutes, but saves you from losing important numbers.

Unbinding accounts and disabling protection against theft

The most critical stage in preparing a Xiaomi smartphone for sale is the correct exit procedure from all accounts. Android security system, starting with the 5th version, is equipped with a mechanism. FRP (Factory Reset Protection, which locks a device after a reset if you don't log out of your Google account. MIUI or hyperos.

First, unplug your device from your Xiaomi account. Go to settings, find Accounts and Sync, or just Mi Account at the top of the menu. Click the logout button. The system will alert you that the data will be deleted from the device but will remain in the cloud — that's exactly what we need for security.

The next step is to exit Google services. In the same Accounts and Sync menu, select your Gmail address. Click on three dots in the corner or the "More" button, then select "Delete Account" -- an action that will break the connection between the phone and the search giant's servers, allowing the new owner to activate the gadget without any problems.

If you've used third-party cloud storage, such as Yandex.Disk, Dropbox or OneDrive, remember to log out of their apps. Often users forget about messengers: Telegram, WhatsApp, Viber. In the settings of these applications, find the Devices or Web versions section and complete all sessions, and then delete the application or clear its data through the system menu.

Cleaning an encrypted memory card and the outer periphery

Many Xiaomi models support memory expansion via microSD cards. If you plan to sell the phone along with the memory card, it should be cleaned separately from the main system reset. Standard formatting via the phone's menu often does not delete data permanently, leaving it to be recovered by attackers.

To reliably remove data from the memory card, it is recommended to use a computer. Connect the card through the card reader to the PC, format it, then fill the entire volume with unnecessary files (for example, movies or archives with random garbage), and format again. This method of overwriting sectors ensures that the old data will be physically replaced by new information.

If the card is formatted as an internal memory (Adoptable Storage), it is encrypted with the key of a particular device. Just take out the card and paste it into another phone will not work, it will be unreadable. In this situation, resetting the phone settings will automatically destroy the encryption key, making the data on the card unreadable, but for complete certainty, it is better to format it as a portable storage before selling.

⚠️ Note: Do not sell a phone with inserted SIM-A card or memory card, unless you have previously cleaned it completely on your computer, can be read from these media regardless of the state of the smartphone itself.

Also worth checking for Bluetooth and Wi-Fi connections. Remove all the gadgets you know from your list of paired devices: headphones, smartwatches, car radios. This will prevent your phone from automatically connecting to the new owner's devices or vice versa, which can cause confusion and privacy problems in the future.

Complete reset procedure to factory settings

When all data is saved and accounts are untied, you can start the final step of completely resetting the system. In modern shells MIUI 12/13/14 and HyperOS, this process is as automated as possible, but requires careful choice of options. Go to the Settings menu, scroll down to the About Phone section or find the Advanced Settings item depending on the firmware version.

You need to find the Reset section. The system will offer two options: “Reset all settings” (which will only return the settings to the factory, but save the files) and “Delete all data.” Choose the second option. Before starting the process, the system will again request the screen unlock password and the Mi Account password to confirm the identity of the owner.

Settings -> About Phone -> Resetting -> Delete all data

An important point is the Clean All option, which can appear in the recovery menu or when reset. Make sure it is active. Some Redmi Note and Xiaomi Mi series models have an additional tick, Format internal memory, which you also need to activate for deep cleaning.

Once confirmed, the phone will restart and the deletion process will begin, which can take 5 to 15 minutes depending on the amount of memory filled. Don't interrupt this process or turn off the device even if it seems to be hanging. The progress indicator may freeze in one place, but the background processes will continue to work.

Additional security measures and encryption

For devices that were released a few years ago and run on older versions of Android, a standard reset may not be enough, because modern systems use default encryption, and when reset, the encryption keys are destroyed, making the data unreadable. On older models, the data is simply labeled as “rewritable” but physically remains on the disk.

To protect these gadgets, before performing the reset, it is recommended to manually fill the device memory with unnecessary information. Record a few videos in maximum resolution or download large files until the free space is exhausted. Then perform a reset. Repeat the filling and reset procedure again for maximum reliability.

• 🔒 Make sure that the device encryption function is activated in the Security section».
• 🗑️ Use a file shredder app to remove sensitive documents.
• 📱 Check if there are any traces left in the Dictophone and Notes apps after resetting.

⚠️ Note: If you have used Second Space or Guest Mode, make sure that the reset is done for all profiles, or use the feature of completely deleting all profiles at once.

Also worth mentioning is biometrics. Before selling, make sure that all fingerprints and facial recognition data are removed from sensor memory. This usually happens automatically when reset, but in the Passwords and Security menu -> Fingerprints can be visually verified that the list is empty.

Final inspection and first launch

Once the reset process is complete, the phone will restart and the welcome window will prompt you to select a language, which is a signal that the data has been deleted. However, for complete certainty, it is recommended not to transfer the device immediately, but to go through the initial stage of setting up (connect to Wi-Fi, enter time) to make sure that there are no errors and activation requests.

If the phone has successfully moved to the desktop or language selection screen without requesting passwords from previous owners, then the procedure for deleting data from the Xiaomi smartphone was successful. The device is ready for transfer to a new user. SIM-cards, unless you plan to give them away with your phone.

Visually inspect the device for cleanliness. Wipe the screen and body with microfiber, remove dust from the connectors. A neat appearance combined with a guarantee of a clean software part will increase the value of your device in the eyes of the buyer and speed up the transaction.