Lost my Encrypt password - How to get back?

Hello guys,

I have some data that is backup by BKE 2010 from 2011.

Now I have build up BKE 2010 R3, and I can't restore those data again.

I don't know because my encrypt password was wrong or I tried restore in another version of BKE?

If It's because my encrypt password was wrong, so how to recover it? 

And do we have any restore solution else?

Thanks guys very much!