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Author Topic: iMac 27 2011, and 6850 based on 6970M MXM Board with BootScreen. Work!  (Read 6231 times)
hamster
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« Reply #15 on: May 11, 2017, 06:38:01 PM »

Duke, can you please explain how you Flash this card in iMac?
I have tried Windows 7, but iMac will not boot with this card installed.
El Capitan works fine and reports 6800 series card and no boot screen.
Please help...
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dukefawks
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« Reply #16 on: July 02, 2017, 10:33:47 PM »

Flash the ROM on an external programmer like EZP2010 or TL866.

I have updated the 1GB ROM again as some later cards moved the EFI to 0x010000. Also thermal issue need to be addressed.

All ROMs and thermal updates on this are posted here:

https://www.rossmanngroup.com/boards/forum/board-repair-troubleshooting/22440-2011-imac-27-6970m-solution
« Last Edit: July 02, 2017, 10:44:21 PM by dukefawks » Logged
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