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Author Topic: iMac 2011: Recent GPU for iMac 2011 needed; flashing? (replacing failed 6970m)  (Read 20888 times)
richardhancock
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Posts: 41


« Reply #90 on: January 30, 2017, 10:54:24 PM »

Do you think that the EFI & parts of the BIOS from the 8800M GTS would work? (attached) Currently running with the correct display mappings (I think) on the DCB but without any EFI at all, as this seemed to cause issues as it was the one designed for the 27 inch. I have been looking at the Nvidia spec, but not too sure exactly what I need to change with connector table entry where I think the hot plug signals are. I think it should start disabling and then enabling each one by one to find out which is which if i can do this in the same way as with the DCB section?

Any help appreciated !

EDIT: Gone back to the ROM Tried before the flash failed and booting in OS X as well again with EFI Boot on External Screen and unscrambled loading on external screen. Strangely OSX Then three quarter loads and neither screens come on but using remote access the iMac Display is detected as an iMac display however no external at all. I think as Florian suggests its the Hot Plug ID's?

EDIT: Just flashed with the below DCB Table and now OS X Works on the External Screen fully with EFI Loading Screen and when booted:

1F 0F 00 01 34 00 01 00
1F 1F 00 01 10 00 02 00
1F 2F 00 01 30 00 02 00
D6 5F 01 08 20 00 42 0F
92 5F 01 08 20 00 02 00
C6 4F 01 08 10 00 42 0F
82 4F 01 08 10 00 02 00
8F 3F 01 08 30 00 02 00
B6 8F 03 04 10 00 42 0F
72 8F 03 04 10 00 02 00
A6 7F 02 02 10 00 42 0F
62 7F 02 02 10 00 02 00
6F 6F 02 02 10 00 02 00
0F 9F 04 02 00 00 00 00

Going to try and mess with the LVDS soon and get internal as well (Hopefully)

EDIT: Rebooted and now not working again  Huh

* iMac21.rom (154.5 KB - downloaded 73 times.)
« Last Edit: January 31, 2017, 12:12:59 AM by richardhancock » Logged
ironsniper
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Posts: 3


« Reply #91 on: May 27, 2017, 09:00:20 PM »

They already are being flashed.

All you need to know can be gleaned from images on EBay.

Some folks in China figured out which cards can be flashed. Instead of being mouthy idiots (like me) they just quietly started selling them. Since "flashed iMac video cards" isn't a thing, nobody asks or lists what they are .

I want to develop some roms, I bought 1 of each card but just haven't found the time. I also need someone in Hollywood with a 2011 iMac, preferably with an MXM cable that allows testing of cards outside machine.
sorry i did not see you reply, what is the device id i would need to look for? and where on the ebay cards would i find it or would it be listed, i want to get a cheap 6770m but all i see are ones from hp laptops and i am not sure if they would work or could be flashed to work with my 2011 27inch imac
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