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Your phone may have a "Secure Boot" feature. Some VIVO models require you to enter your lock screen password before allowing a reset via recovery. This is a security feature to prevent thieves from resetting your phone.
Tap on Backup & Reset . On some Android versions, this might be under System .
You will see three options: Play Sound, Secure Device, and Erase Device. Click on Erase Device .
Confirm your pattern, PIN, or password if prompted.
If you’ve completed the reset successfully, congratulations! Your VIVO Y19 now feels as responsive as the day you unboxed it. Set it up as a new device (don’t restore old backups) for the best performance.