All Samsung Hard Reset Codes step by Step

What does a Samsung Hard reset really means? 

[Answer] What does a hard reset really means? it means to reset your phone to the settings and features
which were accompanied from the company or at firmware update instant.

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There are actually two codes you can use to reset the password and phone setting.
Below are these codes. Type them in the phone and this should solve your problem.

*2767*3855# 

and

*2767*2878# 

The security code will be reset to 0000.
This will allow you to format the phone easily. 

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Here some tutotial how unlock phone, this work on many models:
Follow those steps:

1.)*2767*3855#
2.)*7465625*638*00000000*00000000#
3.)#7465625*638*00000000#