Flash firmware on Vivo Y91C
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How to flash Vivo Y91C?
Why reinstall the firmware?
Errors start to appear in the operating system.
Some applications stop opening.
Many programs from the Play Market do not work.
The phone restarts by itself for no reason.
The phone slows down a lot during operation.
The OS does not match the system requirements of the smartphone.
Where can I find the firmware?
On the official Internet resource of the phone manufacturer.
On sites where developers post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of user data and transfer it to your computer.
Insert an SD card into the gadget. It must have enough memory for the firmware.
Find information about your smartphone model.
Charge your phone fully.
Download archive with Firmware. Place it on the SD card.
Installing TWRP Recovery
Install the Official TWRP App via the Play Market. And run this application.
At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press the 'OK' button.
After moving to the next screen, select the 'TWRP FLASH' item and provide the application with root rights.
On the main screen of the application, select 'Select Device', and find your phone model.
After selecting the phone, the application will redirect the user to a web page to download the modified recovery environment image file. Download the proposed *.img file.
After downloading the image file, return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm your choice.
The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Write the firmware to the SD card. Using a PC or laptop card reader.
Insert a SD memory card into the phone.
To reboot into recovery, you need to use a special item in the Official TWRP App menu, accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. We open the menu, select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.
Firmware via TWRP
Before flashing, it is recommended to clear the 'Cache' and 'Data' sections. This will delete all user data from the device, but avoid a wide range of software errors and other problems. You must press 'WIPE' on the main screen.
Now you can start flashing. Click the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the location where the files were copied. Press the 'OK' button.
Select the firmware file and click on it. A screen opens with a warning about possible negative consequences, you need to check the item 'Zip signature verification', which will avoid using corrupted files when writing to the phone's memory sections.
The procedure for writing files to the phone's memory will begin, accompanied by logging and filling in the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: Brand & Model: Vivo Y91C; Product Release Date: 22 February, 2019; Fingerprint Sensor: Yes; Waterproof: No; Display Type: IPS, LCD capacitive touchscreen; Display Size: 6.22 inches; Resolution: 1520 x 720 Pixels, 24 bit color depth; Multitouch Input: Yes; Display Colors: 16M Colors; Pixel Density (In PPI): ~ 270 PPI; Touch Screen: Multi Touch Support; Touchscreen Technology: Capacitive Touch; Display Protection: Yes; Features: IPS. LCD HD display~ 270 PPI NotchCapacitive Multi-touchScratch Resistant2.5D curved glass screen; Secondary Display: No; Screen to Body Ratio: 83.18%; Camera Type: Dual Camera Set UP (One Front One Back); Rear Camera: 13 Megapixels f/2.2; Image D ...
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