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This from Simon on the MacRumors thread makes it super clear and very simple:

Thank you HaRoMR!

It worked for me
 
same Boot ROM as yours, running 10.6.8

I have downloaded Firmware update files from apple for 1.1 and 1.2

Mounted both dmg

Run app from Netkas forum to update firmaware

It failed (error 5530) but created RAM disk

I opened app again, without pressing "upgrade"

Right click app icon, go to 'show package content'

Opened folder 'contents'

Opened folder 'resources'

Grabbed all without icon and 2 blue folders and dropped in RAM disk

Amended 'ExtractAndPatchEFIFiles.sh' as per your instructions

The only difference is when I opened terminal, I didn't type, just drag 'ExtractAndPatchEFIFile.sh'  and drop into terminal window, that way mac will fill out any required info about path
press enter/return

Then type in "sudo" press 'space' drag 'UpgradeEFI2006-2007.sh' drop into terminal, press enter/return
Type in your password
press enter/return

Shut down

Hold power button till mac light starts to flash

That's it!

Hope it helps anyone

Simon

Thanks to everyone involved in getting this sorted - happy upgraded 2,1 owner with 2 x quad cores running sweet in 2019! Now just need to find a nice cheap GFX card upgrade to beef up the VRAM a tad

Hi,

Any news on a modified "Mac" ROM for the GTX 765M or similar please?
We have so many of these 2011 iMacs to save... :-(

Thanks for the hint  ... the script is still working for me though 

I am performing a firmware update on a 2006 1,1 Mac Pro:

Boot ROM Version: Mp11.005C.B08
SMC Version: 1.7f10
OS X 10.7.5

Nothing in the Mac Pro besides the Hard Drive and stock NVIDIA 7300GT Video Card.

I have done dozens of these firmware updates successfully.  However, this time I am running into the following message:

The program has encountered an error: 5530.

Any help would be great!

Having just been on this for the last few hours trying to get my firmware updated prior to installing my "new" quad xeons my searching has flagged up the possibility that 5530 means that when the script is attempting to retrieve files from the net its not finding them so youre just left with an empty RAM disk. I have read posts that seem to indicate that as short a time as two months ago people were using the Firmware update tool successfully so I could be completely wrong on this.

I found a workaround (that hasnt worked for me as yet - but I am probably doing it wrong) that's as follows: EDIT: Though the original post I copied this from on iFixit had forgotten the origin of the workaround I came across it doing further searching - https://forums.macrumors.com/threads/mac-pro-1-1-firmware-upgrade-issues.2174741/  - scroll down to HaRoMR's post

Can't remember where I found this, but it worked for me.
"I am running 10.7.5. But I did manage to upgrade my 1,1 to a 2,1 some minutes ago. I will describe it here in case somebody else faces the same issues:
1. Get the Upgrade tool from netkas.org via Wayback Machine here as@jbarley suggested or get it from somebody directly like @ColEpsi - thanks!
2. Download the Apple firmware update
3. Mount the .dmg file
4. Use the upgrade tool to create the RAM Disk which in my case directly failed after creating the RAM Disk with the error code 5530
5. Have a look at the content of the upgrade tool and copy the following scripts from /Contents/Resources to the RAM Disk:
1. ExtractAndPatchEFIFiles.sh
2. UpgradeEFI2006-2007.sh
3. DowngradeEFI2007-2006.sh
4. MacProEFIUpdater2006.patch
5. MacProEFIUpdater2007.patch
6. Open ExtractAndPatchEFIFiles.sh with the editor of your choice
- Workaround continues in next post -
April 21 by Dagfinn
Second half of the workaround
7. Remove the following lines:
1. Code:
hdiutil attach -nobrowse MacProEFI2006and2007.dmg

2. Code:
rm -R Expanded

3. Code:
rm -R System

4. Code:
rm Payload

8. Save the script
9. Run it with Code:
./ExtractAndPatchEFIFiles.sh

10. Run the actual upgrade script with sudo rights via Code:
sudo ./UpgradeEFI2006-2007.sh

11. If everything runs through without error proceed with the firmware upgrade:
1. Shut down the Mac
2. Press and hold the power button until it blinks
3. Wait for the upgrade to finish
4. Check the firmware version
5. Reboot in case it does not detect your CPUs correctly until it does.
That did the trick for me.
Thanks again and cheers,
Robert"

For sure part of my problem is that I dont really understand what no's 9 and 10 actually involve doing? I've mucked about in the terminal a bit but so far no luck - if someone could walk me through what 9 and 10 actually mean step by step then I guess it would help a lot of other people too eventually?

EDIT: erroruser then corrects the code as follows in the thread linked to above:

erroruser said:

MacPro2006-2007FirmwareTool left it open an also MacProfirmwareUpdate then did till number 8 Run it with
Code:
/ExtractAndPatchEFIFiles.sh but this was wrong needs to be as so
. /ExtractAndPatchEFIFiles.sh need space between the "." an "/" then drop file in then for 9
sudo ./UpgradeEFI2006-2007.sh is also wrong needs to be
sudo /UpgradeEFI2006-2007.sh no need for "."
then i hit the power button to force shut down an hit the power again an waited for blinking light an BOOM is now completed

Later on down erroruser then adds:  i was using lion 10.6.8 also i made a lil error in the code should have been "/ExtractAndPatchEFIFiles.sh"

Ive no idea which of the above is correct, and I suppose its not totally impossible for a couple of variations to work given we're talking about OS's from 10.6.8 through to 10.11.6 - but I'm damn sure there's any number of people on this forum that can glance at this and rattle off the correct code for idiots like me to cut and paste into the Terminal - pretty please? In the meantime I'll experiment and post back if I make any progress. I've linked to this thread from Hrutkay's YouTube channel - which is a fantastic resource for Mac Pro related upgrades. https://www.youtube.com/channel/UCqM2YtinH-LxHE138gAlkcg
Thanks
Julian

Thanks for the help Ludacrisvp
But I installed disabledlibraryvalidation.kext and system profiler shows it is loaded,
also I installed home brew and ldid and I ldid -S  the mtlbronzedriver
I checked the status of chmod with stat command and got 755 so it should be ok?
but in system profiler nothing from AMD is loaded except AMDsupport, and the UI is jerky.
I include 2 pictures to show the status

Don't mind the ldid error, after that, I signed it on the desktop and then copy it to the bundle

p.s I have opened a thread at MacRumors forum but there is no answer by anyone, so I've find it more helpful here

Im sorry Nektas, but what do you mean by "chmod&chown" ?  I know its something with Terminal but no more

Those are commands for changing posix 'mode bits' aka permissions and file ownership.
In general they need to be owned by root:wheel / 0:0 and permissions of 755 / rwxr-xr-x
You might want to head over to MacRumors forum for help instead.

...tried to boot with my new RX 560 4GB but it seems not working, I have a black boot screen with a lonely cursor, what is wrong, plz can you help me?
Could you give me your video card model/ref also ?

It has been determined to be an issue related to codesign from what I understand.
There is a kext that can disable library validation that will allow it to work, else it would seem if you sign the binary using ldid (installable via brew) that you can get it working without needing the extra kext.

driver does not seem to work with my 7970, installed it via dosdude1 patcher, but I can have a display only if I install legacy video patch and the sse4.1 patch look like not installed on the patch updater

I'm sure your issue is also related to the codesign issue ... much more user-friendly / active discussion around this on the macrumors forum.
You both could try the library validation bypass kext, or the ldid codesign method and probably get the cards working.

I'm able to use my PowerColor RedDevil RX 580 8Gb and Sapphire Pulse RX 580 4Gb using the patch from netkas (eventually it was via the dosdude patcher and the extra kext, i've not tried to change over to the ldid method even though i've installed it via brew)

on the same boat...
driver does not seem to work with my 7970, installed it via dosdude1 patcher, but I can have a display only if I install legacy video patch and the sse4.1 patch look like not installed on the patch updater

Apple replace link that:
'https://support.apple.com/kb/DL205/en_US/iMacFirmwareUpdate1.2.dmg'
https://support.apple.com/kb/DL308/en_US/MacminiFirmwareUpdate.dmg

well, ROPs are tied to specific memory controlllers which are tied to specific memory chips
so you would need to disable 1/4 of rops to achieve you target, not sure if it's even possible. imho it's easier to resolder memory chip via some service

I've been doing some tweaking and thinking. This is a big what if, and since this is a nice little side project on the R9 290X... I would like to try to see if I can revive this card. The card still display, but I narrow it down to bad VRAM.

Here's my logic... Can I not just disable the bad VRAM module and just run the card on 3GB instead of 4GB? When I say disable, I mean, cutting out the power to that certain bad VRAM module and tricking the card to think it isn't even there. Of course, using the Hawaii Bios Editor, is this not possible? If anyone can lend a helping hand or guide me in the right direction, that'll be awesome.