I didn't know there is a different unlocked BIOS, can you send it to me to try? Maybe it will help with other cards, do you have it for for only for GT683 or for GT780 as well?
Maybe changing Vendor ID to MSI ( 1462 ) in vBIOS would help? Do you know vBIOS editor that can change Vendor ID on GCN 2.0 (8000 series and up) AMD cards?
As for these BIOSes - yeah I just got promoted, downloaded a couple of BIOSes and now forum do not allow download more for some reason lol,
Funny enough I didn't got those that I was really after GT683 and GT780