Tips and tricks to fix SAMSUNG GALAXY M21S problems. This is Android smartphone from Samsung which use Octa Core Exynos 9611 64 bit processor with dedicated GPU (graphic processor unit) Mali-G72 MP3 for graphic rendering. We can not use 5G network for Internet access, but it has fast 4G LTE broadband access for streaming movie and playing games without troubles.

When the first time release on the market, SAMSUNG GALAXY M21S use Android 10.0 with One UI 2.5 Samsung user interface. We can see vivid color at Super AMOLED 6.4 inches LCD screen Full HD+ at  1080 x 2340 pixels. There is small notch drop for 32 megapixel front camera. Some issue at SAMSUNG GALAXY M21S software and hardware happen. We will try to give more solutions, reviews and information about how to solve SAMSUNG GALAXY M21S troubles at community.


What are Advantages of SAMSUNG GALAXY M21S Specifications and Features:

  • GSM 3G HSDPA with 4G LTE, Dual Simcard
  • LCD 6.4 inches
  • Internal memory 64 GB with 4 GB RAM
  • Internal memory 128 GB with 6 GB RAM
  • Main Camera Triple 64 MP f/1.8 + 8 MP f/2.2 + 5 MP f/2.2
  • Main Camera Features autofocus, LED flash
  • Front Camera 32 MP for video conference & selfie photography
  • Processor Octa-core 4×2.3 GHz Cortex-A73 & 4×1.7 GHz Cortex-A53
  • GPU Mali-G72 MP3
  • Operating system Android 10.0
  • Battery Li-Ion 6000 mAh



Solution To Fix Camera Problems On SAMSUNG GALAXY M21S


How to Fix or Problem Solving for Recovery SAMSUNG GALAXY M21S hang or not responding or malfunctions or stuck or freezing or bricked ?

There are two different internal storage with 64 GB use 4 GB RAM and 128 GB use 6 GB RAM. More bigger is more better for multitasking and keep more applications. We can use MicroSD / MicroSDXC external memory if we need more storage. There are many interesting applications from Google Play Store whether free or paid.

Please do not install new or not famous applications, because some of them may contain viruses or malware that can make troubles if installed at our SAMSUNG GALAXY M21S such as become slowly or hang or stuck or bricks or frozen or LCD touch screen not responding. They can work as fake games or fake security applications. Please read many user reviews before install any applications. 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 M21S 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.


Easy Solutions To Fix Low Free Storage On SAMSUNG GALAXY M21S


How to Force Shutdown or Force Soft Reset or Reboot or Restart SAMSUNG GALAXY M21S ?


This phone has 4 GB or 6 GB RAM. But some installed applications might crash or corrupt, it makes some not normal performance or LCD touch screen not responsive with finger touch or hang. We have to remove temporary files and caches inside SAMSUNG GALAXY M21S to make it work normally again. Please press and hold POWER button until SAMSUNG GALAXY M21S 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 M21S 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.


Solutions and Tricks For Reset Forgot Samsung Account


How to backup data or Contact at SAMSUNG GALAXY M21S  ?

This phone has external memory MicroSD slot. We can copy all important data from internal memory to MicroSD using Android file manager applications. Do not forget to backup photos and videos from internal memory for backup.

We can use USB data cable for connect SAMSUNG GALAXY M21S with computer PC. After our computer can recognize our phone, then use computer File Manager for browse important files inside internal memory and copy to our computer.

If our SAMSUNG GALAXY M21S 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 M21S



#Option 1, How to Hard Reset SAMSUNG GALAXY M21S with software menu:

  1. Turn on this phone
  2. Make sure SAMSUNG GALAXY M21S 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 M21S will do the process to Master Reset to Factory Default


hard reset samsung galaxy m21s

#Option 2, How to Hard Reset SAMSUNG GALAXY M21S with Hardware key button:

  1. Make sure the battery of SAMSUNG GALAXY M21S charge properly or battery have more then 50% capacity
  2. Turn off SAMSUNG GALAXY M21S
  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 M21S will do the process of restoring to factory default without any password or passcode (hard reset).


How To Make Faster SAMSUNG GALAXY M21S (Fix Slow Performance)?


How to Unlock or Fix or Bypass or Solutions for SAMSUNG GALAXY M21S forgot password code or security lock screen pattern or pin (lost password)?

Because it has sufficient internal storage, then we will keep many important applications after use several period. We also will have many private photos videos which taken from triple camera with 64 megapixel for wide + 8 megapixel for ultrawide + 5 megapixel for DoF or Bokeh. Please secure all confidential data from unauthorized people when SAMSUNG GALAXY M21S stolen or away from us or lost.

The fingerprint of SAMSUNG GALAXY M21S located at rear back body. It is fast and accurate to use. We can use front camera for security unlock. However, after SAMSUNG GALAXY M21S finish reboot, the fingerprint and face detection will not work. We have to activate using secondary protection like screen lock pattern or password pin protection. However, the problems will be happen when we forgot security answer or fingerprint can not work anymore, what should we do?

Do not worry because we can unlock or bypass forgotten screen lock pattern or password pin protections at SAMSUNG GALAXY M21S 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 M21S, because it can help us to bypass forgotten security protections.


When SAMSUNG GALAXY M21S 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.


Solution To Fix Overheat Temperature Issues On SAMSUNG GALAXY M21S



This is the way to help for unlock or bypass forgotten security protection at SAMSUNG GALAXY M21S. 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 M21S, 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 M21S ?

We can try to use secret code for doing hard reset SAMSUNG GALAXY M21S 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 M21S will do hard reset and remove all data also installed applications.


How to Format or Erase Phone Memory at SAMSUNG GALAXY M21S ?

There are two phone memory type at SAMSUNG GALAXY M21S, 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 M21S 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 M21S Stronger, Life Longer and Not Fast to Drain ?

We really happy with SAMSUNG GALAXY M21S battery because it has 6000 mAh capacity with fast charging 15W technology. This phone can work more then two days for several users. However, if we use it too much for playing games or watching movie, then we suggest to do some adjustment for make battery work more longer. Please make LCD screen brightness as low as possible, because it will consume more power. We also have to disable all not use connections like GPS or Bluetooth or Wifi. NFC is not available at SAMSUNG GALAXY M21S.