Originally Posted by Herbertly
You can't access to your iTunes backup if you enter the incorrect password, try to enter the possible password you remember, remember every a bit info of your password.
Other way is try some iTunes backup password recovery application to unlock your iTunes backup, but I didn't suggest you do that!
I have already spent hours on guessing the right password, but there is still no success. and thatís the reason why i am asking here.