![]() check upgraded bootrom version and identifier in System Information.Download MacPro5,1 firmware here -Mount. ![]() If patch is running successfully you can see a big grey loader bar and the apple logo. (If using El Capitan you need to disable System Integrity Protection. Please research if you don’t want to lose the downgrade possibility to 08) The upgraded EFI finally enabled me to complete the boot process and you will have all other advantages of the 2010 and later models (hex-core CPU, faster RAM, Audio over DP) This upgrade is reversible. Downgrading should be possible as well, definitely possible to version 07. I don’t know which Apple EFI version is contained in there. delete bootmgr and bootmgr.efi from the stick to avoid BIOS/CMI boot and force EFI bootīootrom 07 (EFI 1.4) to Bootrom 03 (EFI 1.5) (If your machine shows Bootrom version 08 you could first try to continue without upgrading.drag everything from the mounted ISO onto the USB stick.Load diskpart and make clean install disk by typing: diskpart open command prompt at install screen by pressing shift+F10.Boot into Windows DVD setup to access a Windows command prompt.Ran in to the error "No bootable device detected…", so I used following steps: I've tried to re-install Windows 7 using Bootcamp Assistent, since Windows 10 gave me a lot of headache.
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