Hey guys, i recently upgraded my iMac 27" 2010 model with a Geforce GTX 780M card. It works like a charm, but i lost my boot screen. Now i'm thinking about Flashing the EFI part to the BIOS rom chip but I didn't find any tutorials. I have access to an iMac 27" 2013 with the 780M running. So, I could use the EFI part of this card to flash my own, but as I told, I don't know how. FYI: I did a normal nvflash already and it worked, but nothing with EFI. Thx in regards.