Have a big problem after software update on Iphone 4?

Question

iPhone

Please help, there is such a problem, after updating the software to 5.0 on the Iphone 4 device (the update was successful), you need to restore contacts, sms, etc. from iphone backup file.
I connect the phone, iTunes sees it and offers:
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I click "Continue recovery", and the second message pops up:

"enter the password to unlock the iphone backup file", the problem is that I did not set any PASSWORD, in the field has already driven in all the passwords that came to mind: from AppleID, from iCloud, from SIMCARD, even the access code to the phone.
Does anyone know how to bypass it, or maybe I'm entering the wrong password?
Thanks in advance.

Answer 1

This is the backup password. In the settings, you apparently checked the "encrypt backups" checkbox.
Perhaps the password was saved in the keychain (Application > Utilities > Keychain Access), here is the same problem and solution