How to Easily Master Format OPPO K9S with Safety Hard Reset?

Tips and tricks to fix OPPO K9S problems. This is mid-end smartphone that use 5G broadband connections. It is work with Qualcomm SM7325 Snapdragon 778G 5G processor with dedicated GPU Adreno 642L. The first OS use Android 11 with ColorOS 11.2 Oppo user interface.

The screen size is 6.59 using IPS with 120Hz refresh rate and Full HD+ resolutions. We will give more solutions, reviews and information about how to solve troubles of OPPO K9S at community.

What are Advantages of OPPO K9S Specifications and Features?

  • Network GSM 3G HSDPA or 4G LTE + 5G with Dual simcard slot
  • LLCD 6.52 inches 20:9 aspect ratio
  • Processor Octa-core 4×2.4 GHz Kryo 670 & 4×1.9 GHz Kryo 670
  • GPU Adreno 642L
  • Bluetooth / GPS / Wifi
  • Memory Internal 128 GB
  • RAM 6 GB or 8 GB
  • Main Camera Triple 64 MP f/1.7 + 8 MP f/2.2 + 2 MP f/2.4
  • Main Camera Features autofocus, LED flash
  • Front Camera 16 MP for video conference and selfie photography
  • Operating System Android 11
  • Battery Li-Po 5000 mAh

Solutions To Fix Camera Issues on OPPO K9S

How to Fix or Problem Solving for Recovery OPPO K9S hang or not responding or malfunctions or stuck or freezing or bricked ?

The internal storage is 128 GB that is big for install many applications and games. We can use external memory MicroSDXC card for extend the storage. We have to read many user reviews before download new or not famous applications. Why?

Because some of them may contain viruses or malware that can make troubles at our OPPO K9S such as hang or freezing or become slowly or stuck or broken or LCD touch screen not responsive. 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 K9S ?

RAM is important for multitasking performance. OPPO K9S use 6 GB or 8 GB RAM options. Some 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 K9S turning off or shutdown.

Performing reboot or restart is recommended anytime we want, because it can help to make our OPPO K9S 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 K9S ?

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.

If our OPPO K9S 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 / Contact / Photos on OPPO K9S

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 OPPO K9S with software menu

  1. Turn on the OPPO K9S
  2. Make sure the battery is not empty
  3. Backup important data at OPPO K9S because all data and applications will be erase or delete
  4. Go to Menu : Setting
  5. Choose Tab :General
  6. PressBackup & 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. ChooseReset phone
  9. The OPPO K9S will do the master reset process.

hard reset oppo k9s

#Option 2, Hard Reset OPPO K9S Factory Default using Hardware Secret Button Key

If we can not go to menu, or OPPO K9S 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 K9S
  2. Make sure the battery OPPO K9S already full or more than 50%
  3. Press together and hold thePower Button + Volume Down Button
  4. If the Logo appear, then release the button, after that we will enter some menu
  5. Choosewipe data / factory resetusingVolume Button, and pressPower Buttonto Enter or OK
  6. The OPPO K9S will continue master reset, wait for several minutes until OPPO K9S start like new again.

How to Unlock or Fix or Bypass or Solutions for OPPO K9S forgot password code or security lock screen pattern or pin (lost password)?

With 128 GB internal storage capacity, this phone will have many applications and important data. We also will have several private photos videos that taken from triple cameras 64 megapixel for wide + 8 megapixel for 120 degree ultrawide + 2 megapixel for macro. Therefore, we have to secure all confidential data from unauthorized people, especially when this phone away from us or lost or stolen.

We can use fingerprint that located at side body. 16 megapixel front camera also can use for facial recognizing. We have to choose secondary protection for backup like screen lock pattern or pin or password. Because OPPO K9S fingerprint or face detection can not work after finish reboot or restart. We need to unlock using secondary protection. 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 K9S 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 K9S ?

There is no secret hidden code for OPPO K9S to make it back to factory default. Do the options above to hard reset it.

How to Format or Erase Phone Memory at OPPO K9S ?

When we need to remove or wipe any data and applications from OPPO K9S, 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 K9S.

How to Make Battery of OPPO K9S Stronger, Life Longer and Not Fast to Drain ?

Why OPPO K9S battery drain too fast? First of all, we have to know that this phone has big battery capacity at 5000 mAh with fast charging 30W. Many user can use this phone more then one day. But some users get batter drain problems because they use this phone several hours continuously.

If we want to make the battery work more longer, then please do some adjustment. We need to make LCD screen brightness not too bright to save battery power usage. We also have to turn off all not use connections like GPS or Bluetooth or Wifi. OPPO K9S does not have NFC connection.

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