How to Easily Master Format SAMSUNG GALAXY A21S with Safety Hard Reset?

Tips and tricks to fix SAMSUNG GALAXY A21S problems. The product model code is SM-A217F for single sim and SM-A217F/DS for dual sim because Samsung release single and dual simcard type. This is Low price 6.5 inches Super AMOLED HD smartphone with small hole for 13 megapixel selfie camera.

When the first time release in the market, Android 10.0 already installed and ready to use together with Samsung user interface One UI 2.0. Some users get issue with SAMSUNG GALAXY A21S (SM-A217F) software and hardware, therefore we will try to give more solutions, review and information about how to solve troubles of SAMSUNG GALAXY A21S at community.

What are Advantages of SAMSUNG GALAXY A21S Specifications and Features:

  • GSM 3G HSDPA with 4G LTE, Dual Simcard
  • LCD 6.5 inches HD
  • Internal memory 32 GB with 3 GB RAM
  • Internal memory 64 GB with 4 GB RAM
  • Internal memory 64 GB with 6 GB RAM
  • Main Camera Quad 48 MP + 8 MP + 2 MP + 2 MP
  • Main Camera Features autofocus, LED flash
  • Front Camera 13 MP for video conference & selfie photography
  • Processor Octa-core 4×2.0 GHz & 4×2.0 GHz
  • Operating system Android 10.0
  • Battery Li-Ion 5000 mAh

Solutions To Fix Camera Issues On SAMSUNG GALAXY A21S

How to Fix or Problem Solving for Recovery SAMSUNG GALAXY A21S hang or not responding or malfunctions or stuck or freezing or bricked ?

SAMSUNG GALAXY A21S use Samsung own manufactured processor Exynos 850 to power this phone using Octa Core maximum 2.0 Ghz. This version have three options for RAM and internal memory, first use 32 GB storage with 3 GB RAM and second option 64 GB storage with 4 GB RAM and the last option is the most expensive price 64 GB storage with 6 GB RAM. All type have external memory MicroSD card slot.

Whatever we have, we still can install some important applications from Google Play Store like Kakaotalk, Whatsapp, WeChat, Line Messenger, Facebook, Skype, Instagram and some other more. Please note, some new or not famous apps may contain viruses or malware, therefore we need to read as many user review as possible if we must install that apps, because it can make some troubles like become slowly or hang or stuck or bricks or frozen or LCD touch screen not responding if installed. Usually these bad apps will not get Verified by Play Protect information.

For fix this problems, we have to try remove temporary files and caches by performing soft reset or reboot. When this phone can work again or can boot properly, then please try to download one good free Antivirus from Google Play Store like AVAST or NORTON. This antivirus will scan all installed apps and give recommendation setting for safety usage.

If the problems still happen, then please do hard reset or master format like steps above. Hard reset will remove all important files, therefore we have to backup all data before performing hard reset. All account like Samsung account and Google account will also wipe or remove from SAMSUNG GALAXY A21S after finish hard reset. Please do not install any APK files from unknown resource, because it is very easy to make our phone get some troubles.

Solutions To Fix Insufficient Memory Storage Full Issues On SAMSUNG GALAXY A21S

How to Force Shutdown or Force Soft Reset or Reboot or Restart SAMSUNG GALAXY A21S ?

There are 3 options of RAM for multitasking, but some installed apps still can crash or corrupt. Then our SAMSUNG GALAXY A21S will become run not normal or LCD touch screen not responsive with finger touch or hang. We have to remove temporary files and caches inside SAMSUNG GALAXY A21S to make it work normally again. Please press and hold POWER button until SAMSUNG GALAXY A21S shutdown or turn off by itself.

You may also try press and hold POWER + VOLUME DOWN button to shut it down or restart. After it is totally off, then we can press again POWER button to turn it ON. This process will not remove any important data, therefore we can do this process anytime we want. If our SAMSUNG GALAXY A21S still can work properly, but we want to clear temporary files and caches from some applications, then please press and hold POWER button until pop-up menu appear, continue choose Shutdown / Power off / Reboot menu.

How to backup data or Contact at SAMSUNG GALAXY A21S ?

We can use microSD external card to copy or move important files using File Manager applications. If our SAMSUNG GALAXY A21S has already signed in with Google account, by default our contact will be synchronize in the background to Google server. Please make sure we check all contact at Google contact server using Internet browse to make sure backup is done.

More Complete Solutions To Backup & Restore Data, Photos, Chat On SAMSUNG GALAXY A21S

Please note: These options bellow may not work for some devices because of firmware update version or hardware troubles or some other possibilities.

#Option 1, How to Hard Reset SAMSUNG GALAXY A21S with software menu:

  1. Turn on this phone
  2. Make sure SAMSUNG GALAXY A21S battery already charge properly
  3. Go to menu:Setting >General tab> Backup & Reset > Factory data reset > Reset device
  4. ChooseErase Everything
  5. SAMSUNG GALAXY A21S will do the process to Master Reset to Factory Default

hard reset samsung galaxy a21s

#Option 2, How to Hard Reset SAMSUNG GALAXY A21S with Hardware key button:

  1. Make sure the battery of SAMSUNG GALAXY A21S charge properly or battery have more then 50% capacity
  2. Turn off SAMSUNG GALAXY A21S
  3. Press and hold together :Power Button + Volume Upuntil Logo appear, then release all button
  4. Please wait until we see the menu at LCD screen, chooseWipe Data/Factory ResetwithVolume Buttonto select and usePower Buttonto ok or enter.
  5. The SAMSUNG GALAXY A21S will do the process of restoring to factory default without any password or passcode (hard reset).

How To Fix Hot Temperature Issues On SAMSUNG GALAXY A21S?

How to Unlock or Fix or Bypass or Solutions for SAMSUNG GALAXY A21S forgot password code or security lock screen pattern or pin (lost password)?

SAMSUNG GALAXY A21S (SM-A217F) have good camera with 48 megapixel for wide + 8 megapixel for ultrawide + 2 megapixel for macro + 2 megapixel for DOF at Portrait mode (Bokeh). Selfie front camera also available with 13 megapixel. After use several months, we will have many photos videos inside memory, some of them maybe private or confidential. Therefore we have to secure all important data from unauthorized people when SAMSUNG GALAXY A21S away from us or stolen or lost.

We can use fingerprint which located at back side of body by register our fingerprint several time to make it recognize for unlock. Can we use face unlock? Yes, front camera can be activate for face detection recognizing. After finish register first protections, we have to choose secondary protections like screen lock pattern or password pin protection for backup. Moreover, fingerprint or face unlock can not work after finish soft reset or reboot. The problems will be happen when we forgot security answer or fingerprint can not work, what should we do?

Do not worry because we can unlock or bypass forgotten screen lock pattern or password pin protections at SAMSUNG GALAXY A21S use registered Google account. But we have to do hard reset or reformat our phone using hardware button combination key like steps above. We have to always remember our Google account username and password, because new Samsung smartphone with latest Android version already implement FRP (Factory Reset Protection).

FRP is important to secure our phone when it is stolen or lost. Android will ask for previous same Google account username and password after finish performing hard reset. Therefore we have to remember carefully our Google / Gmail username and password. We also recommended to activate or create SAMSUNG ACCOUNT at SAMSUNG GALAXY A21S, because it can help us to bypass forgotten security protections.


When SAMSUNG GALAXY A21S turn ON but the screen locked then follow this steps:

  1. Mare sure the battery is not empty or more then 50%
  2. When Screen ON but locked, please press and hold POWER BUTTON + VOLUME DOWN button about 5 seconds until the screen off
  3. When the screen off, please directly continue press POWER BUTTON + VOLUME UP button about 4 seconds and release all button
  4. Then you will go to recovery button, choose Wipe data / Factory Reset, then all data will be wipe or the operating system will be reformat to factory default
  5. Please note, this process need us to use previous Google account for authentication after hard reset finish. For bypass FRP:Verify your account with previous Google Account.

Solutions To Fix Lagging Slowly Issues On SAMSUNG GALAXY A21S


This is the way to help for unlock or bypass forgotten security protection at SAMSUNG GALAXY A21S. Although we are sure about our security protection, but sometime we may forget about the right answer. Please note, when we give security protection at our SAMSUNG GALAXY A21S, it also give step to put our own PIN / PASSWORD as BACKUP PASSWORD / PIN. This backup PIN use to bypass or unlock forgotten security code later. Use above steps to unlock forgot password or screen lock pattern security protection using Google account or Gmail username and password or Samsung Account.

Is That Any Secret Code for Doing Format SAMSUNG GALAXY A21S ?

We can try to use secret code for doing hard reset SAMSUNG GALAXY A21S is *2767*3855# (some Samsung hardware or firmware update will not work with this code). But please remember to always be careful typing that code, because the SAMSUNG GALAXY A21S will do hard reset and remove all data also installed applications.

How to Format or Erase Phone Memory at SAMSUNG GALAXY A21S ?

There are two phone memory type at SAMSUNG GALAXY A21S, one is internal memory and the other one is external memory. If we want to format internal memory phone then we have to do hard reset or reformat the operating system of SAMSUNG GALAXY A21S as well. Please use menu setting to do hard reset or reformat using #option 1 above, but make sure to give checkbox mark at Erase Internal SD card / Internal storage. Then it will reformat the factory default operating system and remove or erase any data inside internal memory.

To reformat or wipe or erase all data at external memory, we can use menu Setting > Storage > Erase Internal Storage / SD Card. Please always make sure all data has already backup before reformat or wipe everything, because it is hard to recover formatted / wiped data at internal or external storage.

How to Make Battery of SAMSUNG GALAXY A21S Stronger, Life Longer and Not Fast to Drain ?

SAMSUNG GALAXY A21S (SM-A217F) already use big 5000 mAh batter capacity. This phone have fast charging technology 15W for make quick charger. The battery is not removable. With 5000 mAh capacity, we can work full one day without need to recharge. But if we want to make SAMSUNG GALAXY A21S battery work more longer, then please do some adjustment like make LCD screen brightness as low as possible and disable all not use connections like GPS or Bluetooth or Wifi. We will not get NFC connection at SAMSUNG GALAXY A21S.

How to Hard Reset SAMSUNG GALAXY A21S Secured By KNOX?

First option, we have to make sure our phone is not configured withDisable factory resetat Knox Configure profile. We can try to force hard reset using:

  1. Try to hard reset using Setting Menu
  2. ChooseSettings > General management > Reset > Factory data reset
  3. Choose Reset
  4. Then we have done hard reset our SAMSUNG GALAXY A21S to factory default

Second option, if our phone can not access factory reset from menu setting, then try the other option usingKnox Configure (KC) console menu:

  1. Make Sure our SAMSUNG GALAXY A21S Internet connection is active and at Configured state
  2. From Knox Configure (KC) console, choose Devices > Devices from left navigation menu
  3. Choose the Device ID of our SAMSUNG GALAXY A21S
  4. ChooseActions > Reboot or factory reset device(s)
  5. Wait until pop-up menu show at the screen, then chooseFactory reset device(s)
  6. Choose Confirm
  7. Wait until process finish

4 thoughts on “How to Easily Master Format SAMSUNG GALAXY A21S with Safety Hard Reset?”

    • Hi, please follow some steps above to hard reset SAMSUNG GALAXY A21S to factory default whether using option 1 or option 2 above.

    • Hi, can you give more information about what kind of email that you can not received at your Samsung device?

      However, if you still have some problem like that, pleae try to do hard reset whether using menu setting or hardware button combination key like steps above.


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