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The refurbs that I got were all "high" firmware models with 3G and "low" serial numbers. The first refurb I got, I took the trouble to take apart to look at the socket. I realized that the serial number (and thus the hardware revision) is what determines Softroot compatibility rather than the firmware. I softrooted it from 1.5.0 without trouble.
I didn't even bother taking apart the other refurbs (1.4.3) and just ran 1.0.0 on the Nook drive and then bravo_update-251.dat (renamed to just bravo_update.dat) on the external uSD card (standard Softroot). It worked just fine.
YMMV, of course.
If you have a "high" serial number (> 1003*), you will have to do a bit more fiddling and perhaps even drop down to a lower firmware than 1.5.0. For more details on this, RTFM at nookdevs.com
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