never actually seen this problem, it's all over the internet with lots of people claiming they know the solution. you can try the following;
Quote:
Password of your computer
0000
Other iPhone 4-digit passcode(s) used in past
iTunes password without special characters
First iTunes account password you used
password of other itunes account, if you have more on the machine
Password to other apps on device
Password to other accounts
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If none of those work, you can try bruteforcing it-
Ivan Golubev's Password Recovery Suite