Erasing data from a smartphone on Android is not just pressing the โ€œResetโ€ button. Wrong actions can leave your photos, passwords and correspondence available for recovery, even if you think the phone is โ€œcleanโ€. This article will help you figure out how completely delete information from a device before selling, transferring or recycling, so that no recovery tool can retrieve it.

We will look at all methods: from standard reset through settings to deep formatting through Recovery Mode and even physical destruction of data for paranoid. We'll pay special attention to hidden pitfallsthat are not warned about in official instructions - for example, why Google Account may remain tied to the device even after a reset, or how cloud backups ruin all your efforts.

Important: the procedure differs depending on the version Android (from Android 5.0 Lollipop to Android 14) and the manufacturer (Samsung, Xiaomi, Google Pixel etc.). The article provides universal methods, but specific models may require additional steps.

1. Preparing to erase: what to do BEFORE resetting

Before clicking โ€œDelete everything,โ€ follow these steps - they will protect you from losing important data and prevent problems with your accounts.

  • ๐Ÿ“ฑ Create a backup copy. Use Google Drive (settings โ†’ System โ†’ Backup) or local storage. Remember: after a reset, it will be impossible to restore the data.
  • ๐Ÿ”‘ Delete all accounts. Go to Settings โ†’ Accounts and delete Google, Samsung, Mi Account and others. This will prevent the device from being blocked through FRP (Factory Reset Protection).
  • ๐Ÿ’ณ Unlink bank cards and payment systems. Delete data from Google Pay, Samsung Pay, and disable linking to SberPay/Tinkoff.
  • ๐Ÿ“ก Disconnect the device from networks. Forget saved Wi-Finetworks (Settings โ†’ Wi-Fi โ†’ Saved networks) and disconnect Bluetoothdevices.

โš ๏ธ Attention: If you are selling a phone, do not remove the SIM card until the reset is complete - some operators (for example, MTS or Beeline) link services to the IMEI of the device. Make sure that all subscriber services (Internet, SMS packages) are deactivated.

Delete all accounts (Google, Samsung, Xiaomi, etc.)|

Create a backup copy of contacts and files|

Disable linking of bank cards|

Delete data from payment applications (Google Pay, Samsung Pay)|

Write Phone IMEI (in case of blocking)-->

2. Standard factory reset

The easiest way is to use the built-in reset function. It is available on all devices, but does not guarantee complete data deletion (they can be restored with special apps). Suitable if the phone remains in the family or is given to a trusted person.

Instructions for Android 9.0โ€“14:

  1. Open Settings โ†’ System โ†’ Reset (on some devices the path may differ: Settings โ†’ General โ†’ Reset).
  2. Select Delete all data (factory reset).
  3. Enter the PIN code or pattern if prompted.
  4. Confirm the action. The phone will reboot and begin the process (may take 5-30 minutes).

โš ๏ธ Attention: On devices Samsung c One UI after the reset, you may remain bound to Samsung AccountTo completely unlink the phone, before resetting. go to Settings โ†’ Accounts and archiving โ†’ Delete Samsung account.

What happens during a standard reset?

During a standard reset, Android deletes only links to files in the file system (analogue "recycle bin" on a PC), but the data itself remains on the flash memory until overwritten. Special apps (for example, Dr.Fone or DiskDigger) can restore up to 70% of the information, including photos and messages.

Manufacturer Path to reset to settings Features
Samsung (One UI) Settings โ†’ General โ†’ Reset โ†’ Data reset Requires password entry Samsung Account after reset
Xiaomi (MIUI) Settings โ†’ About the phone โ†’ Reset settings May request binding to Mi Account when you turn it on for the first time
Google Pixel Settings โ†’ System โ†’ Reset options The "cleanest" reset among Android devices
Huawei (EMUI) Settings โ†’ System โ†’ Reset โ†’ Reset all data Requires shutdown Huawei ID in advance

3. data-i="120">If you sell the phone or give it to a stranger, a standard reset is not enough. You need

If you sell your phone or give it to a stranger, a standard reset is not enough. Need to format the data partition via Recovery Mode - this will delete files at a low level, making recovery almost impossible.

Instructions for most devices:

  1. Turn off the phone.
  2. Hold the combination of buttons to enter Recovery:
    • Samsung: Power + Volume up + Bixby (or Home on older models).
    • Xiaomi/Redmi: Power + Volume up.
    • Google Pixel: Power + Volume down, then select Recovery Mode.
  • To menu Recovery (control with volume buttons, selection with power button) select Wipe data/factory reset.
  • Next select Format data or Wipe cache partition (if available).
  • Confirm the action and wait for completion.

    • โš ๏ธ Attention: On On some devices (Samsung from Exynos, Xiaomi to Medatek) formatting via Recovery can lead to partition damageIf after the procedure the phone does not turn on, flashing via Odฤฑn or Fastboot.

    adb shell recovery --wipe_data

    To do this, connect the phone to a PC with drivers installed ADB and USB debugging enabled.-->

    4. How to permanently delete data (for the paranoid)

    If you work with confidential information or just want to be 100% sure that the data is destroyed, use these methods:

    • ๐Ÿ”„ Multiple overwriteAfter resetting, fill the phone's memory with "junk" files (for example, videos in 4K), then reset again. Repeat 3-5 times.
    • ๐Ÿ’พ Encryption + reset. Before resetting, enable device encryption (Settings โ†’ Security โ†’ Phone encryptionAfter resetting, the data will not be accessible without the key.
    • ๐Ÿ”จ Physical destructionFor eMMC/UFSdrives: disassemble the phone and damage the memory chip (for example, drill it).

    โš ๏ธ Attention: Encryption may take several hours and drain the battery. Do not interrupt the process - this will lead to loss of device functionality.

    I reset after settings|

    I format via Recovery Mode|

    I use specialized apps (for example, iShredder)|

    I just delete files manually|

    I donโ€™t erase, I sell โ€œas isโ€-->

    5. Specialized apps for secure erasing

    If you need to delete data with a guarantee, use applications certified according to standards DoD 5220.22-M (US Department of Defense) or GutmannThey overwrite memory using special algorithms.

    Top 3 apps for Android:

    • ๐Ÿ›ก๏ธ iShredder 6 โ€”supports 17 erasing algorithms, including military standards. There is a free version with limitations.
    • ๐Ÿ—‘๏ธ Secure Erase - simple interface, overwrites data with zeros. Suitable for beginners.
    • ๐Ÿ”’ Shreddit - open software, works without root access, but requires connection to a PC.

    How to use iShredder:

    1. Install the application from Google Play.
    2. Select mode Erase Free Space (will remove traces of deleted files) or Erase All Data (full reset).
    3. Select an algorithm (recommended DoD 5220.22-M).
    4. Confirm and wait for completion (may take up to 2-3 hours).

    โš ๏ธ Attention: Secure erase apps require enough battery power (at least 50%) If the phone runs out of power during the process, the data may be damaged, but not completely erased.

    6. How to check that the data is really deleted

    Even after the reset, you should make sure that there is no personal information left on the phone. Here's how to do it:

    • ๐Ÿ” Checking through the file managerConnect the phone to the PC and view the folders DCIM, Downloads, WhatsApp via Total Commander or ES Explorer.
    • ๐Ÿ“ฑ Search for residual files. Install the application DiskUsage or Storage Analyzer โ€”they will show hidden files and cache.
    • ๐Ÿ› ๏ธ Recovery test. Use Dr.Fone or EaseUS MobiSaver to scan the memory. If the apps find files, the reset was unsuccessful.

    If you find residual data:

    1. Repeat the reset via Recovery Mode.
    2. Use iShredder to overwrite free space.
    3. As a last resort, do manual formatting via ADB: 
      adb shell sm list-volumes

      adb shell sm partition disk:179,64 private

      (replace disk:179,64 with your partition data).

    /data/data/ (application remnants), /sdcard/Android/ (game cache and messengers), /sdcard/Telegram/ or /sdcard/WhatsApp/ (media files from chats).-->

    7. Common mistakes and how to avoid them

    Many users make critical mistakes when erasing data. Here are the most common:

    • ๐Ÿšซ Does not delete. SIM card and SD cardThe data on them is not affected when resetting.
    • ๐Ÿ”’ Forget to unlink your Google Account. This leads to blocking FRP (you will need to enter your login/password after resetting).
    • ๐Ÿ“ฑ Reset via "Quick Settings". data-i="226">) offer a "quick reset" from the notification menu - it does not clear the internal memory completely.Xiaomi, Oppo) offer a "quick reset" from the notification menu - it does not clear the internal memory completely.
    • โšก Do not charge the phoneIf the battery runs out during the reset, the device may turn into a "brick".

    โš ๏ธ Attention: On devices with Android 10+ and dynamic partition (Dynamic Partition), a standard reset may not affect some system files. In this case, use the command: 

    fastboot erase userdata

    fastboot erase metadata

    (requires unlocked bootloader).

    8. What to do if the phone does not turn on after resetting

    If after erasing the data the phone does not start (freezes on the logo, shows an error No Command or goes to bootloop), try these steps:

    1. Hard reset. Press Power + Volume up for 10-15 seconds to forcefully turn off the device.
    2. Enter Safe Mode. (Samsung, LG) hold Volume down when turning on to boot into safe mode.
    3. Flashing via Fastboot/OdinDownload the official firmware for your model from the manufacturer's website and. flash via:
      • Samsung: Odฤฑn (file .tar.md5).
      • Xiaomi: Mi Flash Tool (file .tgz).
      • Google Pixel: Fastboot (commands flash-all.bat).

    โš ๏ธ Attention: If the phone is locked via FRP (requires login/password Google after reset), and you do not remember your account details, the only way out is to contact the service center with proof of ownership (receipt or box). data-i="259">How to bypass FRP blocking legally? loss of warranty.

    How to bypass FRP blocking legally?

    If you have forgotten your data Google Account, but your phone is yours, use the official procedure for restoring access:

    1. Go to accounts.google.com from another device.

    2. Restore access to your account via the linked email or phone.

    3. After successful login, the FRP lock will be removed automatically when you connect to the Internet.

    Do not use "bypass" apps โ€”they often contain viruses and can damage the system.

    FAQ: Answers to frequently asked questions

    Is it possible to recover data after a reset via Recovery Mode?

    Theoretically, yes, but in practice it is extremely difficult to format via Recovery overwrites the partition table /data, but file fragments may remain in unused sectors. For full guarantee, use multiple rewrites (see section 4).

    Do you need to delete data from the phone before trading in?

    Yes, definitely! you return the phone to Svyaznoy, MTS or Apple Trade In, perform a full reset. Stores do not guarantee safe deletion of your data. Use the method from section 3 (formatting via Recovery).

    How to erase data if the phone does not turn on (the screen is broken/does not respond)?

    There are two options:

    1. Connecting to PCUse ADB (if debugging is enabled) or apps like Mobikin Doctor to extract data before erasing.
    2. Hard reset. Press the combination for Recovery Mode (see section 3) and execute Wipe data blindly (focusing on vibration or sounds).

      3. If the screen is completely inoperative, contact a service center.

    What to do if after When resetting, the phone asks for the old password?

    This is FRP lock. Solutions:

    • Enter the data Google Accountthat was on the phone before the reset.
    • If you donโ€™t remember your password, restore access via accounts.google.com.
    • For Samsung the service can help Find My Mobile (if the account Samsung has been linked).
    Do not use "bypass" services - they are often fraudulent.

    How to erase data from a phone remotely if it is stolen?

    Use remote control services:

    • Google Find My Device (link) - allows you to block the device and erase data (works if the phone is connected to the Internet).
    • Samsung Find My Mobile - similar, but for devices Samsung.
    • Xiaomi Cloud - for phones Xiaomi/Redmi/POCO.
      • Important: After remote erasing, it will be impossible to restore access to the phone.