Tips and tricks to fix VIVO Y21S problems. This is Android smartphone with dual simcard slot. We can not use 5G connection because it is powered by 4G processor Mediatek MT6769V/CU Helio G80. However, using 4G LTE still acceptable at several country. We can play games without troubles because it is work with Mali-G52 MC2 as dedicated GPU (graphic processor unit). The OS use Android 11 together with Funtouch 11.1 as vivo user interface.

The scree use IPS 6.51 inches size at HD resolutions. We can see notch drop at top screen for front camera 8 megapixel location. We will give more solutions and information about how to solve VIVO Y21S troubles community.


What is Advantage of VIVO Y21S Specifications and Features:

  • 4G LTE
  • LCD 6.51 inches FHD
  • Internal memory 128 GB with 4 GB RAM
  • Main Camera Triple 50 MP f/1.8 + 2 MP f/2.4 + 2 MP f/2.4
  • Main Camera features phase detection autofocus, LED flash
  • Front camera 8 MP for selfie photography and video
  • Processor Octa-core 2×2.0 GHz Cortex-A75 & 6×1.8 GHz Cortex-A55
  • GPU Mali-G52 MC2
  • Operating system Android 11
  • Battery Li-Po 5000 mAh



How to Fix or Problem Solving for Recovery VIVO Y21S hang or not responding or malfunctions or stuck or freezing or bricked ?

We can use internal memory and external memory. The internal storage capacity is 128 GB with 4 GB RAM. There are many applications that we can choose to download from Google Play Store. But we need to be careful because some of them may contain viruses or malware. Mostly new or not famous applications. We have to read many user reviews before download that kind of apps.

If we install that kind of apps, then our VIVO Y21S will get some troubles such as become slowly or lagging or hang or stuck or bricks or LCD touch screen not responding. This bad applications will not get Verified by Play Protect information when we are on downloading process.

How to fix this problems? We have to clean temporary files and caches from phone storage by performing soft reset or reboot or restart. When our phone finish restart, then please install recommended antivirus like NORTON or AVAST. This antivirus will scan all installed applications and give safe Setting recommendation options inside VIVO Y21S.

When this phone still get same problems, we need to do hard reset or master format to make it back to factory default. This process will remove all installed applications and data. Hard reset will erase or remove all Google account from this phone. We suggest only install recommended apps and do not install any unknown APK files.


How to Force Shutdown or Force Soft Reset or Reboot or Restart VIVO Y21S ?

VIVO Y21S work with 4 GB RAM. However, the installed applications may crash or corrupt, that can make VIVO Y21S get some troubles like become hang or LCD touch screen not responsive. We need to do soft reset or reboot to clean up temporary files and caches.


Please Press and Hold Power Button for several seconds until this phone turn off by itself. Then we can try to turn it on again. Usually this phone will work normally after restart.

We can force to clean temporary files and caches when this phone still work properly. How to do that? Press and hold Power Button until pop-up menu appear, then choose Reboot / Shutdown / Power Off menu.


How to backup data or Contact at VIVO Y21S ?

MicroSD / MicroSDXC can be use for backup all important data, photos videos from internal memory. Please choose all important file using Android file manager, copy from internal memory and paste to external memory all important files.

We can use USB data cable for backup all data to PC using File Manager at computer. If our VIVO Y21S 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.


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, Hard Reset VIVO Y21S with software menu

  1. Turn on the VIVO Y21S
  2. It is very important to make sure battery capacity more then 50% or better fully charge
  3. If we still can access file manager or other applications, the please backup all data or photos/videos at VIVO Y21S because all data and applications will be erase or delete
  4. Go to Menu :  Setting > More Setting > Backup and Reset > Erase all data
  5. Give check-mark : Erase Phone Storage if we want to clean / wipe all data
  6. Choose : Erase everything
  7. The VIVO Y21S will do the hard reset or master format to factory default process.



hard reset vivo y21s

#Option 2, Hard Reset VIVO Y21S with Hardware Button Key to Recovery Mode

  1. Turn Off VIVO Y21S
  2. It is very important to make sure the battery is fully charge
  3. Press and hold POWER BUTTON + VOLUME UP BUTTON key until Fastboot menu appear
  4. Release all POWER BUTTON & VOLUME UP Button
  5. Choose Recovery Mode using VOLUME BUTTON and Press POWER BUTTON for Ok.
  6. Choose Clear Data button, and continue choose Clear all data and wait until wiping data finish
  7. At some version you can try to choose Wipe Data or Clear Data option by tap the menu or using VOLUME BUTTON to go up and down at menu and press POWER Button to Ok or Confirm or Choose. It will wipe all data to finish the Hard Reset or Master Format Steps
  8. Wait until the Use VIVO Y21S finish the process and the phone will start again like new


How to Unlock or Fix or Bypass or Solutions for VIVO Y21S forgot password code or security lock screen pattern or pin (lost password)?

We never know when our phone will lost or stolen. Therefore we need to activate security protection for secure all important data inside VIVO Y21S from unauthorized people, especially when this phone away from us. With secure protection, our private photos that taken from triple cameras 50 megapixel wide + 2 megapixel macro + 2 megapixel DoF or bokeh blur effect are remain safe.

There are fingerprint and facial recognizing using 8 megapixel front camera. We need to activate secondary protection for backup like pin or password or screen lock pattern. This is important to unlock VIVO Y21S after reboot or restart. At this time fingerprint and face detection can not work. However, the problems will start happen when we can not unlock this phone or forgot security answer or pattern or fingerprint sensor can not open with our finger hand. What should we do?

We have to force hard reset or reformat VIVO Y21S when we forgot security protections. Please use #option 2 above to do hard reset using hardware button combination key.

VIVO Y21S use latest Android version that already have FRP (factory reset protection) feature. This is important to protect our phone when lost. We have to confirm the ownership by verified using previous Google account username and password when we re-setup again like new.


Is That Any Secret Code for Doing Format VIVO Y21S ?

There is no secret hidden code for VIVO Y21S to make it back to factory default. Do the options above to hard reset it.


How to Format or Erase Phone Memory at VIVO Y21S ?

If we want to remove or erase all data inside VIVO Y21S storage, the easiest way is by performing hard reset whether using #option 1 or #option 2 above. When we do #option 1 process, we need to choose check box options to Erase Internal SD / Internal Storage data.


How to Make Battery of VIVO Y21S Stronger, Life Longer and Not Fast to Drain?

VIVO Y21S work with 5000 mAh battery capacity. It has good performance to make this phone work full one day without recharge. It has fast charging 18W. If we want to make this phone work more longer, then we need to do some adjustment like make LCD screen brightness as low as possible and disable all not use connections like GPS or Bluetooth or Wifi or NFC.


More FAQ of VIVO Y21S:

  • How to Hard Reset Vivo Camera and Music ?

    They are different procedures, but we will try to give one by one. To Reset VIVO camera setting, we have to open Main Camera Applications, then find menu Setting or Icon Setting, and find Restore Default Setting. For reset music, actually it is depend on what kind of apps to hear the music.

  • How To Remove or Bypass Forgotten Pattern or Password or Passcode at VIVO Y21S (Reformat Without Password) ?

    We always recommended to give security for anyone for secure data, but the problems comes when you can not unlock this phone. Please try to do hard reset using hardware button combination key like steps at #option 2 above. This process will reformat your VIVO Y21S operating system to factory default for remove security password or pattern protection. After finish hard reset, you should try to make sure this phone is belong to you by sign-in with Previous Google Account account for security protections.