Tips and tricks to fix SAMSUNG GALAXY M21 problems. This phone release in the year 2020 and already have latest Android 10.0 as factory default operating system together with Samsung user interface known as One UI 2. There are some interesting features inside this phone beside latest Android OS. The Full screen 6.4 inches LCD use Super AMOLED for better view with Full HD+ resolution at 1080 x 2340 pixels.

SAMSUNG GALAXY M21 use Samsung manufactured processor Exynos 9611 with Octa Core CPU and have dedicated GPU (graphic processor unit) Mali-G72 MP3. Some users get issue with SAMSUNG GALAXY M21 usage, such as software or hardware. We will try to give review and information about how to solve troubles of SAMSUNG GALAXY M21 at community.


What are Advantages of SAMSUNG GALAXY M21 Specifications and Features:

  • GSM 3G HSDPA with 4G LTE, Dual Simcard
  • LCD 6.4 inches Full HD+
  • Internal memory 64 GB with 4 GB RAM
  • Internal memory 128 GB with 6 GB RAM
  • Main Camera Triple 48 MP f/2.2 + 8 MP f/2.2 + 5 MP f/2.2
  • Main Camera Features autofocus, LED flash
  • Front Camera 20 MP for video conference & selfie photography
  • Octa-core 4 x 2.3 GHz Cortex-A73 & 4 x 1.7 GHz Cortex-A53
  • Operating system Android 10.0
  • Battery Li-Ion 6000 mAh



Simple Solution To Fix Camera Issues On SAMSUNG GALAXY M21


How to Fix or Problem Solving for Recovery SAMSUNG GALAXY M21 hang or not responding or malfunctions or stuck or freezing or bricked ?

When some users need to have bigger internal capacity, then we can choose 128 GB internal storage with more expensive price. If we want to buy cheaper one, then choose 64 GB internal storage, all type can be extend with big MicroSD external memory, because it have dedicated slot for it. Usually we put our photos videos at external memory to make our internal storage have more free capacity for install applications.

There are many apps that we can install from Google Play Store like WeChat, Facebook, Whatsapp, Kakaotalk, Line Messenger, Instagram and some other more. But we also have to be careful when we need to install new or not famous applications, because some of them may have viruses or malware that can make troubles at our SAMSUNG GALAXY M21 like become slowly or hang or stuck or bricks or frozen or LCD touch screen not responding. Please read some user review for make sure the apps is safe. Usually these bad apps will not get Verified by Play Protect information.

We have to try remove temporary files and caches by doing 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 M21 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 Lagging Performance On SAMSUNG GALAXY M21


How to Force Shutdown or Force Soft Reset or Reboot or Restart SAMSUNG GALAXY M21 ?


There are two RAM options start from 3 GB or 4 GB. More bigger RAM can run more multitasking applications. But some apps may crash or corrupt that make troubles at our SAMSUNG GALAXY M21 like LCD touch screen not responsive with finger touch or hang. We have to remove temporary files and caches inside SAMSUNG GALAXY M21 to make it work normally again. Please press and hold POWER button until SAMSUNG GALAXY M21 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 M21 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 M21  ?

We can use microSD external card to copy or move important files using File Manager applications. If our SAMSUNG GALAXY M21 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 Photos, Data, Contact On SAMSUNG GALAXY M21


#Option 1, How to Hard Reset SAMSUNG GALAXY M21 with software menu:

  1. Turn on this phone
  2. Make sure SAMSUNG GALAXY M21 battery already charge properly
  3. Go to menu: Setting > General tab > Backup & Reset > Factory data reset > Reset device
  4. Choose Erase Everything
  5. SAMSUNG GALAXY M21 will do the process to Master Reset to Factory Default


hard reset samsung galaxy m21


#Option 2, How to Hard Reset SAMSUNG GALAXY M21 with Hardware key button:

  1. Make sure the battery of SAMSUNG GALAXY M21 charge properly or battery have more then 50% capacity
  2. Turn off SAMSUNG GALAXY M21
  3. Press and hold together : Power Button + Volume Up until Logo appear, then release all button
  4. Please wait until we see the menu at LCD screen, choose Wipe Data/Factory Reset with Volume Button to select and use Power Button to ok or enter.
  5. The SAMSUNG GALAXY M21 will do the process of restoring to factory default without any password or passcode (hard reset).


Easy Solutions To Fix Insufficient Memory On SAMSUNG GALAXY M21


How to Unlock or Fix or Bypass or Solutions for SAMSUNG GALAXY M21 forgot password code or security lock screen pattern or pin (lost password)?

This phone have sufficient internal storage to keep many confidential data. Moreover, because this phone have triple camera 48 MP for wide + 8 MP for ultrawide + 5 MP for DOF (deep of field), then we will also have many private photos videos. Please secure all data from unauthorized people, especially when SAMSUNG GALAXY M21 away from us or stolen or lost.

Fingerprint is available at back side of body, we also can use 20 megapixel front camera for face unlock recognizing. After register first protections, we need to register our secondary protections like screen lock pattern or password pin protection. 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 M21 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 M21, because it can help us to bypass forgotten security protections.


When SAMSUNG GALAXY M21 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.


Solved Overheat Troubles On SAMSUNG GALAXY M21 Hot Temperature 



This is the way to help for unlock or bypass forgotten security protection at SAMSUNG GALAXY M21. 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 M21, 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 M21 ?

We can try to use secret code for doing hard reset SAMSUNG GALAXY M21 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 M21 will do hard reset and remove all data also installed applications.


How to Format or Erase Phone Memory at SAMSUNG GALAXY M21 ?

There are two phone memory type at SAMSUNG GALAXY M21, 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 M21 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 M21 Stronger, Life Longer and Not Fast to Drain ?

One important features at SAMSUNG GALAXY M21 is big battery. This phone have 6000 mAh battery capacity with faster charging 15W to quickly charge the battery. But this capacity is not unlimited, especially for heavy users who use this phone for playing games or watch movie several hours continuously, then the battery will not enough. For this kind of user, we suggest to do some adjustment to make SAMSUNG GALAXY M21 battery work more longer. Please make LCD screen brightness as low as possible and disable all not use connections like GPS or Bluetooth or Wifi. NFC is not available at SAMSUNG GALAXY M21.


Latest Discussions & Share Information:

[Q] When forgot password. Does this method work for M21 with Android 11?
[A] Hi, if you forgot about Samsung Galaxy M21 security password, then you must performing hard reset using hardware button combination key like steps at #option 2 above. But please note, after finish reformat, you have to bypass Samsung Galaxy M21 FRP (factory reset protection) by login with previous Google account. This is important to secure our phone and to make sure this phone is really belong to us.

[Q] I bought a new Samsung 21.while activating it I seemed to have mixed up the password for opening the phone.How to open the phone.
[A] Hi, the only solutions for fix forgotten password is by doing hard reset with hardware button combination key like steps at #Option 2 above. Please follow it carefully. You have to know that Your Samsung Galaxy M21 has been use FRP (factory reset protection). You have to make sure that this phone is really belong to you by sign-in or verified with previous Google account for bypass FRP.