Really? I heard the refurb DCs had the updated bios (no homebrew/hacks.) Or maybe it's because the DCs were refurbished by the store, and they probably don't have the tools to update the bios.
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not quite. the whole motherboard design for these dreamcasts is different, it's not just an updated bios. in these newer dreamcasts, the gd-rom controller is entirely integrated into the motherboard (so the entire thing is basically one board + the power supply + the controller interface board)