How can i reset its password, cause i have forgotten it. thank you

You will need to do a full factory reset.

Forgotten Password ' Android Tablet Forum

www.androidtablets.net > ... > Sony Tablets > Sony Tablet S

Jan 28, 2012 - 11 posts - ‎9 authors
My little brother set a password on my tablet and then forgot it .... is there anyone out... there is no 'forgotten password' and i have tried resetting it so i have to a standstill... alright thanks.... how do i do a complete restore ? How Do I "Factory Reset" My Tablet?
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jaafar,


Change your Windows password

Your Windows password is the password you use to log on to your computer. You can help keep your computer more secure by changing your Windows password regularly and by using a strong password.

1. Press Ctrl+Alt+Delete, and then click Change a password.
   
2. Type your old password, type your new password, type your new password again to confirm it, and then press Enter.
   

If you have forgotten your password and you have a password reset disk, you can reset your password.
If you do not have a password reset disk and you have forgotten the password you will need to reinstall Windows or search the internet for password reset software.

Thank You,
Dell-Jesse L
Dell Social Media and Communities

Unfortunately, there is no way to recover a lost or forgotten password from a router or access point; you will need to reset the device to factory defaults. However, once the device is reset to factory defaults, you can use the default username ("admin") and password (either "password" or "1234" depending on your router) to reconfigure your router settings.

or

if there a small hole in the front or back of the router push a hair pin in to reset to factory settings

hope this helps

You can create a Windows password reset disk to reset your lost or forgotten Windows password, i have created one with the tool Windows Password Breaker and reset my administrator password successfully.
Good Luck!

well here ya go,,,,,,, from uR svctag 8YN5BD1-595B we get ur pass
pass = rqj2ht3
if it works...say THANKS

You can reset the password with windows password buster.
See: How to Reset HP Laptop Password?

no choice but to reinstall the OS

You should be able to reset by turning on the phone without the SIM card inside, entering *2767*2878# and waiting for the phone to reset
: )