Easy Steps to restore iPhone backup password

my uncle gave me his iphone 4 to undo the jailbreak so i decided to create a back up first then restore back to clean 4.01, so after the restore is done.. im trying to restore from back up... now its asking for a password? i never put any password when trying to create a back up.. what's password its asking?

I have seen many people met the similar problem, how to restore iPhone 4 backup password when I don't know.  I know a way about iPhone backup unlocker.

Step 1: Downloaded Tenorshare iPhone Bckup Unlocker software from it's offical webside, and used in laptop.

Step 2: Import iPhone Backup Key Container File
Press "Open" and the program will automatically detect and find directory of the key container file for you. You only need to click the file to finish the importing.

Step 3:  Select an Attack Type and Define the Settings
 Before allowing the program to start finding your iPhone backup password, you need to select an attack type.  There are 3 kinds of attack providing in this software:  Brute-force Attack, Brute-force with Mask Attack, Dictionary Attack. Each attack type has its requirements and limitations, and you can select the most appropriate one to effectively and correctly retrieve the iTunes backup file password.

Step 4. Click "Start" to restore iPhone Backup
You are just one step away from your password - click the "Start" button on the bottom of the interface to initiate the program. Do you also forgot iphone backup password, don't worry about it, you can use iPhone Backup Unlocker to help you to recover iPhone Backup password.

Source: http://www.any-data-recovery.com/product/iphone-backup-unlocker.html