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Author Topic: Mac Pro Firmware Upgrade Utility Released!  (Read 1607909 times)
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« Reply #1200 on: July 08, 2018, 08:43:01 PM »

I hope this forum isn't dead. lol

I need to downgrade my original 4,1 (that was upgraded to 5,1 via FW update tool) reason being need to warranty it out the system for an unrelated problem.

The only thing is it keeps failing to downgrade

Current FW is MP51.0087.B00 that was supplied with High Sierra FW update

I downloaded the patched version of the FW tool,852.msg31640.html#msg31640

I still kept getting a 5570 error.

I think I have an idea whats going on, I Believe I have to downgrade to MP51.007F.B03 and then to MP41.0081.B07?

or can it go MP51.0087.B00 right to MP41.0081.B07?

Okay so under OSX High Sierra, i downloaded both FW packaged from Apple 1.4 & 1.5 with the DMG mounted to the desktop the patched FW utility was able to create a ramdisk and said to shut down.

I did the whole flash procedure (hold power button till light flashes & deep beep) however something isn't right, the apple logo appears and the flash progress bar appears but it goes from 0% instantly 100% (I'm talking blink and you'll miss it) and nothing happens afterward. If I shut down and reboot, firmware is still MP51.0087.B00

Remember I'm trying to DOWNGRADE, yes, I'm using all the original OEM hardware CPU/GPU.

I don't know whats keeping it from flashing or at this point its even possible anymore.

I saved the contents of the ramdisk before I shut it down to attempt the flash

Perhaps someone could help shine some light on this.
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« Reply #1201 on: July 09, 2018, 11:24:50 AM »

Have you tried using official Apple Firmware Restoration CD?

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« Reply #1202 on: October 07, 2018, 08:10:48 AM »

Hey guys,
I'm having problem to rollback the firmware of my Mac Pro 5.1 2010, from MP51.0089.B00 EFI to MP51.007F.B03. Is there a way to make it possible, and, if i choose the downgrade to 4.1 with the help of the firmware upgrade utility, it will not brick my Mac?
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