This is the official page, where you will find the Official Vivo Stock Firmware ROM (Flash File). The Firmware comes in a zip package and contains Flash Tool, IMEI Tool, USB Driver, Flash File, How to Flash Manual.
Vivo Y91 PD1818F Firmware (Stock ROM)
The Vivo Firmware helps you to downgrade or upgrade the Stock Firmware of your Vivo Smartphone, FeaturePhone and Tablets. It also allows you to fix any IMEI related issue, Software related issue, bootloop issue.
Package Name: Vivo_Y91_PD1818F_EX_A_1.8.25_LA.UM.6.6.2.R1-04200-89XX.0_QFIL.zip
How to Flash: Follow Guidelines
Package Size: 4 GB
How to Flash Vivo Y91 PD1818F Firmware (Stock ROM)
Step 1: Download and Extract the Vivo Y91 PD1818F Firmware Package on the Computer.
Step 2: Once you have successfully extracted the firmware Package, you will be able to get the Flash File, Flash Tool, IMEI Tool, Driver and How-to Flash Manual.
Step 3: Now, Install the provided Qualcomm USB Driver on the Computer.
Step 4: Once you have successfully installed the USB Driver, Open QFIL Flash Tool on the Computer.
Step 5: Once the QFIL Flash Tool is Launched, Connect your Vivo Smartphone to the Computer by using the USB Cable.
Step 6: Now, Click on the Download or Upgrade Button in the QFIL Flash Tool to begin the Flashing process.
Step 7: Once the flashing is completed, you will see a Success Message at the End.
Step 8: Now, Disconnect your Vivo Y91 PD1818F Smartphone from the Computer and Restart it.
[*] QFIL Flash Tool: If you wish, you can download the latest version of QFIL Flash Tool from QFIL Flash Tool for Windows page.
[*] Backup: We recommend you to take a backup of your personal data from the device, before flashing or writing the Stock Firmware or IMEI because flashing the stock firmware or IMEI may permanently delete your personal data from the device.
[*] Original firmware: The above Vivo firmware is the original firmware, released by the Vivo Mobility Inc. We have scanned the firmware with Eset Internet Security before publishing it online.