A!CS 8 android 4.0 ics loced

[pip2009]

hi my son has a A1CS 8 android tablet 4.0 ics and he has forgot his pass word .the device is asking for his email to unlock it but the email is not recognised ,so it will not unlock .I have taken it to my local IT centre and they say they can not do anything with it . is there anyone able to help