Cramdown (forcing the lender to accept actual value with payments over time) is a chapter 13 process. The chapter 7 equivalent is redemption (lump sum payment of actual value). So cramdown does not work in a chapter 7, and you question is not answerable. Best to consult with an attorney who knows these things.
Redemption is for personal property. If you convert, you will need to qualify for a 13 (may be a problem if you exceed the debt limits) AND you need a plan that can pay off the value over 3-5 years. See local lawyer for a complete review.
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A "cramdown" can occur only in a Chapter 13, not a 7, as my colleagues have noted.
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