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The DuoX 2 Cromwell/FlashBios Edition comes with Cromwell 2.32 on one bank and Cromwell 3.03 on the other bank.  You'll have to flash it with a BIOS of your choice to be able to play backups.  The regular DuoX 2 comes pre-flashed with a 1.0-1.5 compatible BIOS on one bank and a 1.6 compatible BIOS on the other bank.  It doesn't really matter which chip you get.  If you don't want to bother flashing the chip, go with the regular DuoX 2.  But you can always flash it to a different BIOS (including Cromwell) if you so desire.