Can't help you with the password. You will have to perform a factory reset or recovery on it. The procedure for doing that depends on the make and model which for some strange reason you have not included in your post. Look on the manufacturer's website under "Support".
The information on Computing.Net is the opinions of its users. Such
opinions may not be accurate and they are to be used at your own risk.
Computing.Net cannot verify the validity of the statements made on this
site. Computing.Net and Purch hereby disclaim all responsibility
and liability for the content of Computing.Net and its accuracy.