I was aware of this bit in the DM5 User's Guide:
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Note: Only VBOB units with part number 013-2746-004 (or later) can be upgraded
at a customer site with the DM5 option. All other VBOB units must be exchanged as
part of the upgrade.
I got a VBOB type 013-3646-006 rev A with my Tezro. It has the DM5 option installed (the one with three DVI connectors). It reports "VBOB firmware revision 1.3.22" on the serial console.
I've seen a 013-2746-006 rev A on eBay and it seems to be an older serial# (MPT811) than mine (NSYxxx). Coincidentally, I had just ordered a VBOB (with DM5) for my Octane2, and received another 013-3646-006. Nearly the same serial# as the one I have with the Tezro. This part number doesn't show up anywhere. What's up?