pleeeeeeeease help me
i own an ASUS TF300 tablet

recently chnaged pattern and i forgot it , i have google account , but also when i enter pattern wrong 5 times and when it asks asks for google account , i enter my gmail and the gmail password but it says : invalid username or password , i am sure that my gmail and password are true becasue i just opened my google account on my desktop pc with the same gmail and password ! , just cant undersatnd why it says that they are invalid , any solution ?!