Recover from Pattern lock problem with Galaxy 551

If your phone is locked with pattern lock, and if you try different option too many times, your phone will lock out.

It will display a screen with

User id
Password

Which should be gmail account information. But even after providing these information, it will not unlock.

If you are willing to reset your data, you have another option. Which is to factory reset using adb of android sdk

Connect your phone to PC or laptop via usb cable.
If you do not have android sdk, download it to your computer.
Open command prompt on PC, by typing cmd in run command
Go to the android sdk directory and then platform-tools directory
Now type

adb reboot recovery in the command shell

in the command shell

Your phone screen should look somewhat similar to this diagram.

Open the keyboard of your phone
Use ALT key of phone to scroll through options.
Go to wipe data and factory reset
Type left shift key of the phone to run the option
After you get the prompt saying data is reset, go to reboot system now
Again type shift on phone
Your phone will reboot to factory condition

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