Resetting settings on Samsung Galaxy A12 is a universal solution for most software problems: from slowdowns to the inability to boot the system. However, an incorrectly performed procedure can lead to the loss of important data or even bricking of the device. In this article, we will analyze all the current reset methods (including hidden functions), explain the difference between recovery mode), let's explain the difference between soft reset and hard reset, and also show how to prepare for the procedure to minimize the risks.

The model Galaxy A12 (code designation SM-A125F, SM-A125M etc.) has features in the recovery menu that distinguish it from the flagship lines Samsung. For example, there is no option Wipe Cache Partition in the standard form, and button combinations for entering Recovery Mode depend on the firmware version. We took into account all these nuances and collected instructions that work on One UI 3.1–5.1 firmware (Android 11–13) Before you begin, answer two key questions: Do you need a reset (eliminating errors, preparing for sale, removing viruses?) and One UI firmware 3.1–5.1 (Android 11–13).

Before you begin, ask yourself two key questions: why do you need a reset (fixing errors, preparing for sale, removing viruses?) and what data it is critical to save. The choice of method depends on this - from a simple restart to complete formatting of the internal memory.

1. Preparing for the reset: what to do before you start

Even if your Samsung A12 barely responds to touch, find a way to complete these steps. They will save hours on data recovery and prevent common errors.

  • 🔋 Charge the battery to at least 50%. When resetting through Recovery Mode the device does not show the charge level, and a sudden shutdown may damage system files.
  • 📱 Make a backup copy via Settings → Accounts and archiving → Archiving and restoration. This is especially true:
    • Contacts (synchronize with Google Account)
    • Photo/video (copy to PC or cloud)
    • Messages (use Samsung Messages Backup or SMS Backup & Restore)
  • 🔑 Make sure you know the details from your Samsung and Google account. After the reset, you will need proof of ownership (FRP protection).
  • 📡 Disable all locks: pattern key, PIN, fingerprint. This will simplify access to the device after a reboot.

If the phone does not turn on or is stuck on the logo, skip the backup and go straight to hard reset. In this case, data recovery is only possible using specialized software (for example, Dr.Fone or Tenorshare UltData), but there are no guarantees.

Make sure the charge is ≥50%|Synchronize contacts with Google|Copy photos/videos to PC|Remember login/password for Samsung Account|Disable all lock screens-->

⚠️ Attention: If you are resetting your phone before selling it, be sure to log out of all accounts (Google, Samsung, Mi Accountif used) and remove the SIM card. The buyer will be able to activate the device only after your confirmation via Find My Mobile.

2. Method 1: Soft reset - reboot without data loss

Soft Reset is a forced reboot of the device, which helps with freezing, slow operation or unresponsive applications. Data and settings are not affected.

How to:

  1. Hold the button Power + Volume Down for 10-15 seconds.
  2. Wait for vibration and the logo to appear Samsung.
  3. Release the buttons - the phone will reboot in normal mode.

This method works even if the screen does not respond to touches, but the device turns on. If the problems persist after rebooting, proceed to hard reset.

💡

If the phone is stuck on the loading screen for more than 5 minutes, try connecting it to the charger for 10-15 minutes, and then repeat the Soft Reset. Sometimes this helps with a low battery that does not display the actual charge level.

Problem Will Soft Reset help? If not, the next step
The phone is slow Yes Clearing the cache or Factory Reset
The application constantly crashes Yes Reinstalling the application
The screen does not respond to touches Yes (if the buttons work) Hard Reset via Recovery
The phone does not turn on No Charging + Hard Reset

3. Method 2: Reset via settings (Factory Reset)

This method is suitable if the phone turns on and responds to touches. It deletes all user data but retains system files and firmware. The process takes 5–10 minutes.

Step-by-step guide:

  1. Open Settings → General management → Reset.
  2. Select Reset data (Factory data reset).
  3. Scroll down and press Reset (blue button).
  4. Enter PIN/password/pattern to confirm.
  5. Confirm the action, by clicking Delete everything.

After the reboot you will be prompted to set up your phone as new. At this stage, you can restore data from a backup copy (if one was created).

⚠️ Attention: On some firmware Samsung A12 after the reset, the error “The reset could not be completed” may appear. In this case, repeat the procedure or use Hard Reset via Recovery.
What to do if after resetting the phone asks for the old password?

This triggers FRP (Factory Reset Protection) protection. To unlock your device, you will need:

1. Login and password for the Google account that was linked to the phone before the reset.

2. If you don’t remember the data, use the service Find My Mobile from Samsung (you need access to the email specified during registration).

3. As a last resort, contact the service center with proof of purchase (receipt or box).

4. Method 3: Hard reset via Recovery Mode (for non-working phones)

Hard Reset is a reset via the engineering menu (Recovery Mode), which works even if the system does not boot. The method deletes all data, including firmware (but does not affect files on the SD card if it is installed).

Instructions for Samsung Galaxy A12:

  1. Turn off the phone (hold the power button for 10 seconds if it freezes).
  2. Press simultaneously:
    • Power button + Zoom volume (for most versions)
    • If it doesn’t work, try Power + Volume up + Home (on models with a physical Home button)
  • Hold the buttons until the logo appears Samsung, then screen Recovery Mode.
  • Use the volume buttons to select Wipe data/factory reset, confirm with the power button.
  • Select Yes — delete all user data and confirm.
  • After completion select Reboot system now.

    • The process may take up to 15 minutes. If after rebooting the phone freezes on the logo again, the firmware may be damaged - you will need to reflash it via Odin.

    Through Settings (Factory Reset)|Via Recovery Mode (Hard Reset)|Soft Reset (Soft Reset)|Haven't tried it yet-->

    ⚠️ Attention: On some versions Samsung A12 (especially with firmware One UI 4.1) in Recovery Mode there may be no option Wipe Cache Partition. This is normal - the cache is cleared automatically when Factory Reset.

    5. What to do after the reset: setup and recovery

    After a successful reset Galaxy A12 you will be prompted to go through the initial setup. Here's what you need to do first:

    • 🔄 Restore data from backup (if it was created). To do this, at the setup stage, select Copy applications and data → From Samsung/Google backup.
    • 🔒 Set up a screen lock (we recommend a PIN or pattern - they are more reliable than a fingerprint).
    • 📱 Update the firmware via Settings → Software update. This will fix possible bugs after the reset.
    • 🛡️ Install an antivirus (for example, Malwarebytes or Bitdefender), if the reset was due to viruses.

    If you reset the phone to eliminate errors, check for them after setup. For example:

    • Run problematic applications.
    • Check the operation of the camera, speakers, microphone.
    • Connect to Wi-Fi and a mobile network.

    If problems persist, they may be related to hardware malfunctions (for example, a damaged motherboard or battery). In this case, contact the service center.

    💡

    After the reset, do not restore the data from the backup copy if the phone was infected with a virus. First, install an antivirus and check the copy for threats.

    6. Frequent errors and their solutions

    Even if the reset is performed correctly, problems may arise. We have collected typical errors and ways to eliminate them.

    Error Cause Solution
    Phone does not enter Recovery Mode Incorrect or damaged button combination button Try an alternative combination (see section 4) or connect to a PC to reset via Odin
    After resetting, it asks for the old password (FRP) Google protection is activated Enter data from the previous account or use Find My Mobile
    Reset is interrupted at 50% Damaged system files Repeat the procedure or flash the phone via Odin with official firmware
    The phone does not turn on after Hard Reset The battery is low or the firmware is damaged Charge for 30 minutes, then reset again. If it doesn’t help, flashing it

    If none of the methods helped, perhaps the problem is hardware. For example, a faulty memory chip (eMMC) can simulate software glitches. This can only be diagnosed in a service center using special equipment (for example, UFI Box or Octoplus).

    7. Alternative reset methods (for experienced users)

    If standard methods do not work, you can use additional tools. These methods require technical skills and may lead to loss of warranty.

    • 🖥️ Reset via ADB (Android Debug Bridge): 
      adb shell recovery --wipe_data

      Requires enabled USB debugging and connection to a PC.

    • 📂 Flashing via Odin:
      1. Download the official firmware for Samsung A12 from the site Sammobile.
      2. Install Odin3 and drivers Samsung USB.
      3. Connect the phone in mode Download Mode (hold Power + Volume down).
      4. Upload the firmware to Odin and press Start.
  • 🔧 Reset via service menu (for some firmware versions):

    Enter in dialer code ##7780## (Soft Reset) or *2767*3855# (Hard Reset). Attention: the second code completely formats the internal memory without confirmation!

    • ⚠️ Attention: Use of unofficial firmware or modified kernels (for example, TWRP) can lead to network blocking (IMEI) or the impossibility of updating via OTA. On Samsung A12 s Exynos 850 such experiments are especially risky due to the closed download (Locked Bootloader).

    FAQ: Answers to common questions questions

    Is it possible to reset a Samsung A12 without losing data?

    No, a full reset (Factory Reset or Hard Reset) always deletes user data. However, you can:

    • Make a backup before resetting (see section 1).
    • Use Soft Reset - it reboots the phone without deleting files.

      • If the phone does not turn on, remove the SD card (if there is one) - the data on it will be saved.

    What to do if after resetting the phone does not see the SIM card?

    This is a typical problem after resetting to Samsung A12 with firmware One UI 3.1–4.0. Try:

    1. Restart the phone.
    2. Insert the SIM card into another slot (if available).
    3. Update the firmware via Settings → Software update.
    4. Reset settings network: Settings → General management → Reset → Reset network settings.

    If that doesn’t help, contact the service center (the SIM card module may be damaged).

    How to reset Samsung A12 if you forgot the pattern key?

    There are three options:

    1. Through a Samsung account:
      • Enter the wrong key 5 times → a button will appear Forgot your pattern key?.
      • Enter your account data Samsung or Google.
    2. Through Find My Mobile:
      • Go to the website findmymobile.samsung.com.
      • Select the device and click Unlock.
  • Hard Reset via Recovery (will delete all data).

    • If you do not remember the data from your accounts, you will need to contact the service center with confirmation of purchase.

    How long does a reset take on a Samsung A12?

    Time depends on the method:

    • Soft Reset: 1–2 minutes.
    • Factory Reset via settings: 5–10 minutes.
    • Hard Reset via Recovery: 10–15 minutes (maybe longer if there is a lot of user data).
    • Flashing via Odin: 20–30 minutes.

    If the process takes longer than 30 minutes, do not interrupt it - this may damage system files. Wait until it completes or the battery drains.

    Is it possible to cancel the reset after it has started?

    No, once the reset is confirmed, the process cannot be stopped. However:

    • If the reset is performed through Recovery Mode, you can remove the battery (on non-removable batteries - hold the power button for 20+ seconds), but this is risky and can lead to brick (inoperability) of the device.
    • If the reset is stuck at one stage for longer 30 minutes, try to force reboot the phone and repeat the procedure.

    It is better to wait until the reset is completed, even if it is slow.