Seems like there is no clear answer. If it helps, two weeks ago I bought a "new" PSP 3000 at Target. It was on 6.37, so I returned it (of course, that doesn't matter now because of the 6.38/6.39 downgrader). Yesterday I bought a 3000 at another store, and it was 6.30. So go figure. I think 6.35+...