I've been working with several Decklink SDI cards (and Decklink Studio) without problems for more than 2 years now, but 2 (!) newly bought Decklink SDI cards won't work - because after installing the driver, I get the following error message:
Hm.An error has occured that has prevented the firmware on your DeckLink card from being upgrade. Try restarting your computer and upgrading the firmware again.
The serial numbers of the working cards are around 400000, whereas the newer card is about 806000.
Several versions of the DeckLink software have been tried (from current v9 over v8 - back to v7.6.4 - the one, I've been working with on exactly the same setup for years).