Unlock Pattern lock in android, if you forget Gmail username and password.

1. Factory reset through boot menu

There is a facility in all android devices to enter to its boot menu like what we are doing in our PC.

In Galaxy mobile series, first switch off your mobile, then

Press Volume button + Home Button + Power button

Until Samsung logo appears.

Now you are in boot menu of the device.

Select the option “wipe data / factory reset”

 

You can navigate through boot menu using Volume Up, Volume Down and Power button or in some devices with Home button.

Volume Up      - Going up
Volume Down - Going Down
Power button or in some devices with Home Button - Selection


After Factory resetting, select Reboot.

Declaimer: Do it at your own risk. We are not responsible for any damage happen to your device. 

2. Install a custom ROM for your device

You can install a new Custom ROM for your android device. For this you need to root your device. I can't illustrate the rooting process here because; there are lot and lot of android devices in the market. For rooting, it needs different tools and procedures for different devices.

Do this only if the warranty ended and you have an accurate Knowledge about rooting procedures.

You will get the rooting tools and Custom ROM's for your device by simply Google it. If you are doing it with in warranty period, warranty will break up. Also new Custom ROM's will give your mobile a new look.