Are you sure that's the case? The way to prove it would be to boot a GD-R as well. Otherwise it seems much more likely that the boot logo was added to a standard DC bios. Another good test would be to see if it runs any of the games incompatible with the devbox (Shenmue is one, I can't remember who it was that showed me a list at some point).
Also, I'd like to have a reverse of this, a devbox bios that I can flash onto my devbox and supports milCD.
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