Apple EFI Rom for Geforce GTX 780M

[DriveSlow]

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.

 

[Npalamidis]

Hello @driveslow,

Did you manage to get the 780M flashed with the imac EFI? Today I installed my card and it was working like a charm until I installed Yosemite beta 4 and it stopped working, I now can only access using screen sharing. My display is black all the time.

Please let me know if you have any suggestions.

 

[DriveSlow]

Hello @driveslow,

Did you manage to get the 780M flashed with the imac EFI? Today I installed my card and it was working like a charm until I installed Yosemite beta 4 and it stopped working, I now can only access using screen sharing. My display is black all the time.

Please let me know if you have any suggestions.

Sorry for the late answer. No, I wasn't able to flash my card. But sometimes I got the same issues like you. Did you installed the Nvidia Driver for OS X?

 

[RobertArrington]

DriveSlow, were you able to find a dumped ROM for the 780M? I can't find one anywhere.

 

[mhren]

DriveSlow, were you able to find a dumped ROM for the 780M? I can't find one anywhere.

I know this is an ancient thread -- but with the failing graphics cards in the 2011 iMacs a 780M may be a great option .... especially if the ROM can be updated with the 2013 GTX 780M Mac version. Di you guys ever get a rom image pulled from your 2013 iMac ?