Performing a hard reset helps you restore all phone settings to the manufacturer's default.
Note: All data (photos, contacts, messages, etc.) will be completely erased. However, if the device has a screen lock password, it cannot be removed.
Follow the instructions below to hard reset Vivo V7+:
Step 1: Power off completely, hold down the power + volume up buttons to access the recovery interface.

Power off completely, hold down the power + volume up buttons to access the recovery interface.
Step 2: Select Wipe data.

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

Proceed to select Wipe data.
Step 4: Enter the screen lock password (if any).

Enter the screen lock password (if any).
Step 5: Proceed to select Wipe data.

Proceed to select Wipe data.
Step 6: Success.

Success.
Congratulations! You have successfully completed the setup process. Wishing you all the best.