Tips and tricks to fix OPPO A91 problems. The mid end smartphone with 6.4 inches AMOLED LCD screen & Full HD+ resolutions at 1080 x 2400 pixels. Do not worry about the scratch resistance because Oppo use Corning Gorilla Glass 5 for protect the LCD. When the first time release in the market, OPPO A91 use Android Pie 9.0 together with Oppo user interface ColorOS 6.1. Like other Oppo smartphone, this phone have dual simcard slot but the good news about this slots are not shared with external memory, because OPPO A91 already have dedicated slot for external memory MicroSD maximum 256 GB. OPPO A91 have four vertical camera at back side of body . Find more review and information about how to solve OPPO A91 (PCPM00) troubles at community.


What is Advantage of OPPO A91 Specifications?

Network GSM 3G HSDPA or with 4G LTE Dual simcard
LCD 6.4 inches 20:9 aspect ratio
Processor Octa-core 4 x 2.1 GHz Cortex-A73 & 4 x 2.0 GHz Cortex-A53
Bluetooth / GPS / Wifi
Memory Internal 128 GB
GPU Mali-G72 MP3
Main Camera Quad 48 MP f/1.8 + 8 MP f/2.2 + 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 Pie 9.0
Battery Li-Po 4025 mAh



How to Fix or Problem Solving for Recovery OPPO A91 hang or not responding or malfunctions or stuck or freezing or bricked ?

OPPO A91 use big fast internal memory with 128 GB UFS 2.1, this is faster type of internal memory. But moreover, this phone have very big RAM for multitasking with 8 GB RAM, therefore we can switch between each multitasking applications faster. With 128 GB, there are a lot of apps we can install from Google Play Store like WeChat, Instagram, Whatsapp, Facebook, Kakaotalk and some other more.

Please understand that Google Play Store is open place to store applications from all developers, some bad developers create their fake apps which may contain viruses or malware. If we install that kind of apps, then our OPPO A91 will get some troubles like hang or stuck or broken or frozen or LCD touch screen not responsive. We suggest to read as many user review as possible before download that kind of applications. These kind of apps will not get Verified by Play Protect information / icon.

If we get this problem, we have to try remove temporary files and caches inside this phone, because some troubles can be solve with this steps. If we are suspected infected by virus, then please install one good antivirus like Avast or Norton, then scan all content inside this phone. However, if the problems still happen, then we have to do hard reset to reformat our phone. Please remember, doing hard reset or master format can make our important data removed or wiped from this phone, this is also happen with all Google account which will remove from OPPO A91. We are not recommended to install APK from unknown resource for safety reasons.


How to Force Shutdown or Force Soft Reset or Reboot or Restart OPPO A91 ?

OPPO A91 (PCPM00) have big RAM, therefore we can run many multitasking without troubles. But problems may comes when some apps crash or corrupt. Our OPPO A91 phone can become hang or LCD touch screen not responding with any finger touch. We need to do soft reset or reboot to remove temporary files and caches. Please press and hold POWER button until OPPO A91  shutdown or turn off by itself. After this phone 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 OPPO A91 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 OPPO A91 ?

Please use MicroSD to backup all important data inside this phone. We have to choose important data using Android File Manager, then copy that folders and paste to External memory MicroSD.

If our OPPO A91 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 on OPPO A91


#Option 1, Hard Reset OPPO A91 with software menu

  1. Turn on the OPPO A91
  2. Make sure the battery is not empty
  3. Backup important data at OPPO A91 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 A91 will do the master reset process.


hard reset_oppo_a91

#Option 2, Hard Reset OPPO A91 Factory Default using Hardware Secret Button Key

If we can not go to menu, or OPPO A91 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 A91
  2. Make sure the battery OPPO A91 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 A91 will continue master reset, wait for several minutes until OPPO A91 start like new again.


How to Unlock or Fix or Bypass or Solutions for OPPO A91 forgot password code or security lock screen pattern or pin (lost password)?

OPPO A91 is mid-end smartphone with cheap price, but have four camera 48 megapixel for wide + 8 megapixel for ultrawide + 2 megapixel for macro + 2 megapixel for DOF or Bokeh. We can use this phone to take photos at any situations. Having aperture number f/1.8 at wide standard camera, will help us get bright photos at low light situations. Some photos or videos maybe private and will not necessary to access by unauthorized people, usually when this phone away from us or lost or stolen. Therefore we have to activate security protections like fingerprint or face unlock. Fingerprint is located under display. After fingerprint or face unlock activated, we have to choose secondary protections like screen lock pattern or password pin protections. The problems will start happen when we can not unlock this phone or fingerprint can not work for unlock. What should we do?

Don’t worry because we can unlock or bypass forgotten screen lock pattern or password pin protections at OPPO A91 use registered Google account. Previous Google account is very important because it will use for security verification after force from Hard Reset or Master Format to Factory Default. Because after hard reset, the LCD screen will display: Verify your account with previous Google Account. Please use Forgot email link if we forgot our account.

New OPPO smartphone already use 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 pin. At some Android version, we can bypass using previous installed Google account username and password after finish performing hard reset or master format. But at some other version update, we still have to type our screen lock pin or password protections. We can bypass using software at personal computer, but these steps are complicated for many users. Therefore we suggest to ask OPPO service center for bypass protections. We also recommended to activate or create OPPO ACCOUNT at OPPO A91, because it can help us to bypass forgotten security protections.


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 A91 ?

There is no secret hidden code for OPPO A91 to make it back to factory default. Do the options above to hard reset it.


How to Format or Erase Phone Memory at OPPO A91 ?

If we want to format internal memory phone then we have to do hard reset or reformat the operating system of OPPO A91 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 OPPO A91 Stronger, Life Longer and Not Fast to Drain ?

OPPO A91 (PCPM00) already have big battery for daily usage at 4025 mAh battery capacity. The battery is not removable, we have to bring our phone to authorized service center if we want to replace the battery after lifetime reached. For some heavy users who have many social media group chat or watch movie several hours continuously, then the battery will not enough. Please do some adjustment like make LCD screen brightness as low as possible. Disable all not use connections also recommended to save battery usage like GPS or Bluetooth or Wifi. OPPO A91 does not have NFC.