Well that depends on why the score is currently at 570.
Like Chris mentioned, there may be an option to use a Rapid-Rescore to get his score up very quickly. That would work if there are some specific items on his credit that could be verified and updated. For instance, if he is just carrying too much debt then it is possible to strategically pay down balances and get the score updated in a matter of a week or so. I have had scores increase more than 100 points using this within the last few months.
BUT, it all depends on what he has on his credit. If he has multiple collections and missed payments he is in a much tougher situation.
Oh, and by the way. As a wholesale mortgage broker I work with FHA lenders that will allow the score to be as low as 600.
Best of luck,