- Go to Setting, Find kernel version in About.
- Tap it seven times, at which point you should see the message, "You are now a developer!" With that done, tap Settings, About Phone, Developer Options, and then tick USB debugging." Then tap OK to approve the setting change.
- Now turn it ON in fastboot mode and unlock the bootloader.
- Install a recovery to help you with flashing.
- Flash a supporting custom ROM and gapps.
XDA Developers is a great site to help you with the process, support and Custom ROMs.
Check the below video for One click root method that works on many latest devices:
You can find all the specs here: Vivo Y19
You can simply reset your Android to factory settings through "Backup and Reset" feature available in settings.
However, this won't work if your phone has got hanged or you have forgotten the password.
Here is a Quick reference to hard reset your phone:
You can see the video to perform hard reset here:
You can see detailed specs of the phone here: Vivo Y19