Open the Vivo phone Settings
Tap Security or Passwords and security
Enter your current screen lock or account password if prompted
Look for Security question, Password recovery, or Account security
Select the option to change the security question
Choose a new security question
Enter the new answer
Save the changes
If the option is not available, open your Vivo account settings or the linked account app
Update the security question from the account recovery or security section
If needed, reset the account password first before changing the security question