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Remember that once you get your score up, you still need to remove all the disputes from your file. Read Shane's answer in this thread on page 1 http://ficoforums.myfico.com/t5/Mortgage-Loans/Best-Way-to-Remove-quot-Account-In-Dispute-quot-for-M...
From my own personal experience. It’s do able but its going to take some rebuilding In December 2014 I had high 500 scores but not eligible for any mortgage loan product -FHA lender overlays meant I could not get any financing with scores of 594 mid score.That said. Please spend time in the rebuilding forum. I camped there for 3 months and they will help you clean up