First of all you have to know about how to install TWRP and custom rom on your vivo smartphone.
STEPS FOR INSTALLING ANDROID 12 ROM on Your Vivo Smartphone.
After performing these 25 steps you will install Android 12 - LineageOS 19 - AOSP Android 12 Custom Rom on Your Vivo Smartphone.
Step 1. To begin with, turn off your Vivo Device.
Step 2. Reboot your Vivo device into Fastboot Mode.
Step 3. Connect your Vivo device to the PC using USB Cables.
Step 4. On your PC, open the ADB tools folder. Here open the command prompt. You can open the command prompt by entering cmd in the address bar. Then hit the enter button.
Step 5. Check if your Vivo device has been connected to the ADB tool or not by entering the command –
Step 6. If you see the serial number, it indicates that your Vivo device has successfully been connected to the PC.
Step 7. Now in order to unlock the OEM of Vivo device, enter the below command –(command is not available)(click for new method) (Skip to Step 10. if you have already unlocked the OEM and Bootloader of your Vivo device.)
Step 8. Now you will see a pop-up on your screen. Simply choose ‘unlock Bootloader’.
Step 9. Your Vivo device bootloader will now unlock and factory reset will be performed on Vivo device.
Step 10. Now you will have to flash the TWRP Image file in Vivo device.
Step 11. Hit the Enter Button.
Step 12. You will now be in the TWRP Recovery Mode. Here you will see a number of options in Vivo device.
Step 13. In the TWRP Modifications, make sure to change the Slot of your Vivo device to Slot A.
Step 14. Then Go back to Home> tap on Reboot> tap on Bootloader. Your Vivo device now again entered into fastboot mode.
Step 15. Go to your PC and again enter the same TWRP image command and hit enter.
Step 16. Now on your Vivo device, go to TWRP Recovery Mode. You will now notice that the current Slot of your Vivo device will be A.
Step 17. Go to PC> Partition Resizer file. Choose the file type as per the storage of your Vivo device. Then move this file to the internal storage of your Vivo device.
Note – In case you are unable to copy or move this file to the device storage, go to your Vivo device, in the TWRP Recovery Mode, choose ‘Wipe’> ‘Format Data’> type ‘YES’> hit the Bluetick mark. Go back to the Home button. Choose ‘Reboot‘ and reboot the device. Then again flash the TWRP image file and change the slot. The file should now be able to be copied to internal storage.
Step 18. In TWRP Recovery, go to Install> choose the file and Swipe to confirm flash.
Step 19. Once the file is flashed, go to the main menu> format data. Again go back to Wipe>Advanced Wipe> Choose System. Swipe to Wipe.
Step 20. Go to main page. Tap on reboot and boot your device into fastboot mode by tapping on the bootloader.
Step 21. Go to your PC and in the same folder in the command prompt, enter the below command –
Step 22. Hit enter and you will soon see a message – Changing current slot to slot A.
Flashing Android R developer Preview File
Step 23. Open the Android R Developer Preview file on Vivo V19 that you downloaded from the link mentioned above.
Step 24. Double-tap on Clean flasher file.
Step 25. This procedure will take as long as 10-15 minutes. Hence, be patient. Once it is finished, your Vivo V19 device will automatically boot into the system with Android 12.
Once you see the Android 12 logo, you will soon receive a few errors or notifications. Just click ok and then you are all set to setup Android 12 on your Vivo Device.
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Link:
PLEASE WAIT - WE WILL UPDATE THE POST REGARDING FLASH FILE.ZIP FOR Your Vivo Device.
