Attorney told me to ask the lender for permission.

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Im gonna do a pre-foreclosure deal. I called some attorneys in my area and one of them said I need the lender's permission to make the homeowner's back payments because if I dont ask for permission im just wasting my time. What do I do? When you buy a pre-foreclosure do you ask the lender for permission? Also, he said the lender will want me to have a good credit as well. What do i do in this situation?