Attempt to draw the pattern at least 5 times.
Note: If no Google account is configured, or the PIN/Password unlock options are used, the device will require a hardware reset.
After the fifth unsuccessful attempt, a notification will appear.
Tap OK and allow the retry timer to count down to zero.
Tap Forgot pattern.
Enter the Username and Password for the Google account attached to the handset and tap Sign in.
Draw a new unlock pattern to replace the forgotten one and tap Continue.
Note: To delete the drawn pattern and create a different one, tap Retry.
Draw the same pattern again and tap Confirm.
The lock pattern has been changed.