How to remove android pattern on it as my son locked it and can't remember pattern lock. The reset at the back is not working

how to reset links below.
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Hard reset your Android phone or tablet when you forget the passcode or...

Android Tablet Password Reset

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How To Unlock My Tablet if Forgot the Unlock Pattern

As far as I am aware you will have set the pattern lock.. It's usually a four digit code that you need to input by sliding your finger across a digital pad WITHOUT removing the finger from the pad until you've finished. If you can't remember the code try some possibles, remembering that you probably have a limited number of attempts before itr locks up you could also try settings on the android.

From off Press power and volume + buttons together til reset screen comes on, then select factory reset! This will take it back to when new!

After a few attempts to guess pattern it should prompt for the gmail account assigned to the phone. Then allow a pattern reset and confirm.

1. Enter wrong pattern 5 times and wait for 30 seconds.
2. Select "Forgot pattern" and enter your email account username and password.
3. Make sure you use the same account that was used to activate the device and double check the password by logging in to that email account in a browser.
4. If you don't have access to the original email account, you will need to do a hard reset and loose your settings and apps on the devcice. The data on the memory card will not be wiped though.
Note: if you can't remember your email password, you will have to visit the email service support page to get it reset.
also, see here...
http://www.androidtablets.net/forum/android-tablet-usage-tips-tricks/6280-forgot-your-unlock-pattern.html
or here... http://mytabletguru.com/forgot-password-pattern-unlock-of-android-tablet/

my sister put a lock on mine

Im thinking you have to reset it, you might lose contacts but my sister reset her phone and it was better than having to pay to get access to her phone.

I tried this its not working... please help

1.Download Multitool from the link given below
https://www.mediafire.com/?pffp15v19lp89li

2.Connect you tablet with PC or laptop
3. Run multitool software and remove the pattern by pressing the proper key.
4 Enjoy

Hello Jachin, if you still have this problem. Try doing a "hard reset"
- Turn off tablet
- Hold down the power and volume "down" key together
- when red text appears select "yes" by holding down power key for 10 secs.

Reformatting shall commence

Please note that this process works on most android tablets.

Hope this helps