A hard reset allows you to revert all phone settings to the manufacturer's defaults, including the screen lock password.
Note: All data (photos, contacts, messages, etc.) will be erased.
Perform a hard reset on Vivo Y69 following these instructions:
Step 1: Power off your device completely, then press and hold the power button + volume up to enter recovery mode.

Power off your device completely, then press and hold the power button + volume up to enter recovery mode.
Step 2: Select Wipe data.

Select Wipe data.
Step 3: Proceed to select Wipe data.

Proceed to select Wipe data.
Step 4: Success!

Success!
Congratulations! Your setup process is now complete. Wishing you all success.
