7xxx rom creating test.

[matacao]

Thanks, I'll test with this correction.

[HenrysCat]

Actually try the one attached, I made it from your original, make sure you have a backup first

[matacao]

Thanks a lot, I'll try when I've some free time!

[ivr]

Sharing my successful experience with flashing Gigabyte R9 280X rev 2.0 to 7950. Even though it looks scary, it's really simple.

Steps I took:

- download the script from the page 1.
- dump the rom with ati win flash utility. I used a separate windows 10 machine
- put the card back to mac and copy the original rom the the folder with the script and run it.
- script creates fixed efi rom which I then flash on windows box (obviously I switch the card back again to windows 10 machine).
- after flashing is complete, I return the card to MacOS and voila... bootscreen.

A few notes:

- As R9 280X is 7970, while the rom is based on 7950, it will be slightly slower. My Geekbench OpenCL compute test went from 36019 to 34261. Not a big deal
- Rominator posted MAC7970.ROM on this forum but I wasn't sure how to use it so I didn't risk it.

I considered renaming it from MAC7970.ROM to MAC7970.efi and running it with the "--efifile=MAC7970.efi" part of the command from first page but I didn't want to brick my card. If anyone has some tips for using the 7970 that would be great.

Anyway, lots of pages to read so I wanted to summarize for new readers. All you need is page one scripts and instructions and ORIGINAL rom from your card. Don't risk using premade ones from other cards, it's not worth the risk. This is a lot easier to do than it looks

Cheers!