Tips and tricks to fix VIVO Y91 problems. Vivo give some options for anyone who want to buy cheap smartphone, they release VIVO Y91 who powered with Android Oreo 8.1 together with Funtouch version 4.5 to make it work smooth for normal applications. This entry to mid level smartphone already have good features like dual camera and full screen LCD at 6.2 inches using HD resolutions. VIVO Y91 use Qualcomm SDM439 Snapdragon 439 to run all applications. We still can play standard game with VIVO Y91 because it already have dedicated GPU (graphic processor unit) Adreno 505, but some heavy games can not play smooth or work with some lag or slow. Find more review and information about how to solve trouble of VIVO Y91 at www.hard-reset.org community.

 

What is Advantage of VIVO Y91 Specifications:

GSM 3G HSDPA, Dual SIM Card GSM+GSM / CDMA
4G LTE
LCD 6.22 inches
Internal memory 16 GB ROM with 2 GB RAM
Internal memory 32 GB ROM with 3 GB RAM
Main Camera 13 MP f/2.2 + 2 MP f/2.4, phase detection autofocus, LED flash
Front camera 8 MP for selfie photography and video
Processor Octa-core 2 x 1.95 GHz Cortex-A53 & 6 x 1.45 GHz Cortex A53
Operating system Android Oreo version 8.1
Battery Li-Ion 4030 mAh

 

 

How to Fix or Problem Solving for Recovery VIVO Y91 hang or not responding or malfunctions or stuck or freezing or bricked ?

There are two options of VIVO Y91 when release in the market, the difference are at internal and RAM options. First we can choose minimum 16 GB internal memory with 2 GB RAM or the second one we can choose 32 GB with 3 GB RAM which is more expensive. We suggest to buy more bigger RAM (3 GB) because it is important to make our VIVO Y91 can work with less lag. RAM is use to hold multitasking applications. Lets say we have 16 GB internal memory, that internal memory already use to keep operating system and factory default applications, therefore we will not get full 16 GB storage. But we still have some free capacity to install more applications from Google Play Store.

But we have to know that some new or not famous applications at Google Play Store may contain malware or viruses which can make our VIVO Y91 hang or stuck or bricks or LCD touch screen not responding. Usually it will not get Verified by Play Protect information when we are on download process. How to fix it?

We have to try force soft reset or reboot to clean temporary files and caches. After our VIVO Y91 can start boot again then please install one good antivirus like NORTON or AVAST, it will scan all installed apps and give recommendation setting for safety use. If the problems still happen, then we have to do hard reset or master format VIVO Y91. All account including Google account will remove or wipe or deleted after finish hard reset. Hard reset process also will remove/erase all important files from internal memory. Please do not install unknown APK, because it is very easy to make our VIVO Y91 get some troubles.

 

How to Force Shutdown or Force Soft Reset or Reboot or Restart VIVO Y91 ?

This phone have two options of RAM, more smaller RAM usually will make some lag or stuck when opening too much apps together. Sometime that apps also crash or corrupt that can make make VIVO Y91 become hang or LCD touch screen not responsive with our finger. Then we have to do soft reset or reboot or restart to remove temporary files and caches. Please press and hold POWER button until VIVO Y91 shutdown or turn off by itself. After it 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 VIVO Y91 still can work properly, but we want manually clear temporary files and caches from some applications, then please press and hold POWER button until pop-up menu appear, continue to choose Shutdown / Power off / Reboot menu.

 

 

How to backup data or Contact at VIVO Y91 ?

We can use microSD external card to copy or move important files using File Manager applications. If our VIVO Y91 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.

 

#Option 1, Hard Reset VIVO Y91 with software menu

  1. Turn on the VIVO Y91
  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 Y91 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 Y91 will do the hard reset or master format to factory default process.

 

hard reset vivo y91

#Option 2, Hard Reset VIVO Y91 with Hardware Button Key to Recovery Mode

  1. Turn Off VIVO Y91
  2. It is very important to make sure the battery is fully charge
  3. Press and hold POWER BUTTON + VOLUME UP BUTTON key
  4. Release POWER BUTTON after the LCD show Logo (do not release VOLUME UP Button at this steps)
  5. Wait until menu appear then we can no release VOLUME UP Button
  6. Choose Wipe Data option by 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
  7. Wait until the Use VIVO Y91 finish the process and the phone will start again like new

 

How to Unlock or Fix or Bypass or Solutions for VIVO Y91 forgot password code or security lock screen pattern or pin (lost password)?

Some users does not activate security protections because they are not understand about how important to keep our private data secure from unauthorized users when VIVO Y91 away from us or lost or stolen. Please use fingerprint, this phone will ask to register our fingerprint several time when the first time open or setup this phone from beginning. We can choose face unlock recognizing to replace fingerprint options. After we are finish with first protections, the secondary options will be ask to work as a backup. We can choose to use screen lock pattern or password pin protections. The problems will start happen when we can not unlock this phone or forgot security answer or fingerprint sensor can not open with our finger-hand. What should we do?

 

Do not worry about this trouble, as far as we already signed-in with Google account, we still have change to unlock forgotten security protections at our VIVO Y91. Please turn on VIVO Y91, then try give wrong answer continuously until VIVO Y91 locked or freezing about 30 seconds, at this time we can find Forgot Password / Pattern button, press that button and this phone will ask for Google / Gmail account username and password which have already signed-in when the first time activate this phone. If we can not access our Google account, then we have to do hard reset or master format VIVO Y91 using hardware button combination key like steps at #option 2 above.

 

Is That Any Secret Code for Doing Format VIVO Y91 ?

There is no secret hidden code for VIVO Y91 to make it back to factory default. Do the options above to hard reset it.

 

How to Format or Erase Phone Memory at VIVO Y91 ?

There are two phone memory type at VIVO Y91, 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 VIVO Y91 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 VIVO Y91 Stronger, Life Longer and Not Fast to Drain?

For normal user, the battery of VIVO Y91 is already big enough at 4030 mAh capacity. We can not replace with bigger battery if we want to make it work longer for heavy users who play games or watch movie several time continuously. However, we can do some adjustment like make LCD screen brightness as low as possible. Please disable all not use connections to save battery life. If some applications want to know our locations, try to activate GPS battery saving mode from menu Setting > Location.

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