Tips and tricks to fix OPPO F21 PRO 5G (CPH2341) problems. This is 5G version of F21 PRO family that work with Qualcomm SM6375 Snapdragon 695 5G. It has same screen size 6.43 inches with AMOLED type and also powered by Android 12 operating system when the first time release at the market. It use ColorOS 12 Oppo user interface. Follow some steps below for more solutions and information about how to solve troubles of OPPO F21 PRO 5G on community.


What are Advantages of OPPO F21 PRO 5G Specifications and Features?

  • Network GSM 3G HSDPA or 4G LTE + 5G with Dual simcard slot
  • LLCD 6.43 inches 20:9 aspect ratio
  • Processor Octa-core 2×2.2 GHz Kryo 660 Gold & 6×1.7 GHz Kryo 660 Silver
  • GPU Adreno 619
  • Bluetooth / GPS / Wifi / NFC
  • Memory Internal 128 GB
  • RAM 8 GB
  • Main Camera Triple 64 MP f/1.7 + 2 MP f/2.4 + 2 MP f/2.4
  • Main Camera Features autofocus, LED flash
  • Front Camera 16 MP for video conference and selfie photography
  • Operating System Android 12
  • Battery Li-Po 4500 mAh


How to Fix or Problem Solving for Recovery OPPO F21 PRO 5G hang or not responding or malfunctions or stuck or freezing or bricked ?


The internal storage capacity is 128 Gb with 8 gB RAM. By using Qualcomm SM6375 Snapdragon 695 5G and Adreno 619, there are many apps and games that we can download from Google Play Store. But we have to read many user reviews before install new or not famous apps. Why?

Because some of them may contain viruses or threat or malware that can make troubles if installed on our OPPO F21 PRO 5G such as hang or freezing or become slowly or stuck or broken or LCD touch screen not responsive. They can install some unknown apps and stolen our data. These kind of apps will not get Verified by Play Protect information / icon.

What do we have to do? Please try to remove temporary files and caches from internal memory by performing soft reset or reboot. We might get some help from antivirus applications like AVAST or NORTON to find suspected application and fix some bad setting options.

We also can clean temporary files and caches anytime by performing reboot or restart. This procedure will not remove any installed applications and important data, therefore we can do this process anytime we want. Please do not install APK from unknown resource for safety reasons.


How to Force Shutdown or Force Soft Reset or Reboot or Restart OPPO F21 PRO 5G ?

OPPO F21 PRO 5G (CPH2341) has 8 GB RAM for multitasking. Some other installed applications also can get hang or make LCD touch screen not responding. We have to force reboot or soft reset or restart by press and hold POWER button until OPPO F21 PRO 5G turning off or shutdown.

Performing reboot or restart is recommended anytime we want, because it can help to make our OPPO F21 PRO 5G become faster. It will remove any temporary files and caches. All applications and data will not removed or wipe because of soft reset or reboot or restart.



How to backup data or Contact at OPPO F21 PRO 5G ?

This phone has external memory slot for MicroSDXC memory card. We can copy and paste all important files, photos, videos from internal memory using Android file manager.

We can use USB data cable to connect with computer. After our phone recognize by computer, then choose important files using computer file manager and copy to safety location at our computer. We also can connect OPPO F21 PRO 5G with flash drive at USB OTG port.

If our OPPO F21 PRO 5G 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 below may not work for some devices because of firmware update version or hardware troubles or some other possibilities.

#Option 1, Hard Reset OPPO F21 PRO 5G with software menu

  1. Turn on the OPPO F21 PRO 5G
  2. Make sure the battery is not empty
  3. Backup important data at OPPO F21 PRO 5G because all data and applications will be erase or delete
  4. Go to Menu :  Setting 
  5. Choose Tab : General
  6. Press Backup & Reset > Restore factory setting
  7. Better you not check anything at the option if you do not want to erase data at data partition at internal memory
  8. Choose Reset phone 
  9. The OPPO F21 PRO 5G will do the master reset process.


hard reset oppo f21 pro 5g CPH2341


#Option 2, Hard Reset OPPO F21 PRO 5G Factory Default using Hardware Secret Button Key

If we can not go to menu, or OPPO F21 PRO 5G can not turn on or hang or stuck or frozen so we can not access the menu setting or nothing happen while touch the screen, then try to factory reset with secret button and hardware key

  1. Turn off the OPPO F21 PRO 5G
  2. Make sure the battery OPPO F21 PRO 5G already full or more than 50%
  3. Press together and hold the Power Button + Volume Down Button
  4. If the Logo appear, then release the button, after that we will enter some menu
  5. Choose wipe data / factory reset using Volume Button, and press Power Button to Enter or OK
  6. The OPPO F21 PRO 5G will continue master reset, wait for several minutes until OPPO F21 PRO 5G start like new again.


How to Unlock or Fix or Bypass or Solutions for OPPO F21 PRO 5G forgot password code or security lock screen pattern or pin (lost password)?

This phone has 128 GB internal memory. We will have many private data, apps and photos videos that shoot from triple cameras 64 megapixel for wide + double 2 megapixel for macro and depth of field. That is why we have to activate security protections like fingerprint or facial recognizing for secure from unauthorized people when OPPO F21 PRO 5G away from us or stolen or lost.

We need to choose secondary protections for unlock OPPO F21 PRO 5G (CPH2341) after reboot or restart, because at this time fingerprint and face detection will not work. However, the problems will start happen when we can not unlock this phone or fingerprint can not work. What should we do?

If we forgot or can not unlock OPPO F21 PRO 5G security protection, then nothing we can do unless doing hard reset or master format using hardware button combination key like steps at #option 2 above. For more security protection, latest Android version has FRP (factory reset protection), therefore it will ask for previous Google account username and password to bypass FRP question.



If we can not turn off our OPPO smartphone, then please force soft reset or reboot by press POWER BUTTON + VOLUME UP BUTTON for several seconds (usually less then 10 seconds) until this phone reboot by itself.


Is That Any Secret Code for Doing Format OPPO F21 PRO 5G ?

There is no secret hidden code for OPPO F21 PRO 5G to make it back to factory default. We need to choose one following options above to hard reset.


How to Format or Erase Phone Memory at OPPO F21 PRO 5G ?

When we need to remove or wipe any data and applications from OPPO F21 PRO 5G, then please performing hard reset or reformat. Please choose Erase all data / Internal storage when our phone has that menu. Performing hard reset or reformat will remove any registered Google account from OPPO F21 PRO 5G.


How to Make Battery of OPPO F21 PRO 5G Stronger, Life Longer and Not Fast to Drain ?

OPPO F21 PRO 5G (CPH2341) has 4500 mAh battery capacity. The battery is not removable. It has fast charging 33W. This phone can work full one day, but if we want to make the battery work more longer, then we have to do some adjustment like make LCD screen brightness as low as possible and turn off all not use connections like GPS or NFC or WiFi or Bluetooth.