EFI and Firmware update from 4,1 to 5,1 for Sierra Upgrade Solved

"Hey Rich:

You have two issues: First the physical firmware you have in your MacPro is version 4,1 and the only update Apple has is update 1.4 for that machine. As you know it requires the firmware 5,1 to work.

At this time Apple isn't showing any upgrade path for your machine. And given the list of what else Apple is dropping off in the way of software, it's unlikely Apple will issue a firmware patch for your machine.

You can see if you can request that Apple will make an exception, and issue a firmware update to allow it but everyone knows that will fall on deaf ears.

And like Dan said, there just may be too many issues in Sierra that a hack fix may not be able to address. Say hi to your awesome techs.

According to Apple forum the error 5570 is basically to tell you your 4,1 firmware 1.4 is already up to date: https://discussions.apple.com/thread/682..."

I actually bypassed all of this by installing High Sierra on a 2012 mac pro and moving the hard drive to the Early 2009 Mac Pro 2 x 2.26 Ghz Quad Core... Boom. Running like a champ.

"Hello,

i have the same problem with my MacPro4,1 RAM disk is created, but the update doesn't work

So, you just boot on an external hard drive a clean El Capitan system and run the Mac Pro 2009-2010 Firmware to perform the update ? Sound great ! Could you just tell me i'm right ?

Thank you."