From the lock screen, drawing the incorrect pattern 5 times will provide access to pattern lock reset options.
Tap OK.
To access your device using your backup PIN, tap BACKUP PIN.
Wait until the timer reaches 0.
Enter your backup PIN.
Tap OK.
Alternatively, to access your device using your Google sign-in details, tap 'FORGOT PATTERN?'. Note: The device must be linked to a Google account for the 'Forgot pattern' option to display.
Enter the required Google email and password.
Tap SIGN IN.
The lock screen has been reset. Tap the desired option, then follow the on-screen prompts to set up a new lock.