- Download the full installer:
softwareupdate --list-full-installers
Finding available software
Software Update found the following full installers:
* Title: macOS Ventura, Version: 13.1, Size: 11931164KiB, Build: 22C65
* Title: macOS Ventura, Version: 13.0.1, Size: 11866460KiB, Build: 22A400
* Title: macOS Ventura, Version: 13.0, Size: 11866804KiB, Build: 22A380
* Title: macOS Monterey, Version: 12.6.2, Size: 12104568KiB, Build: 21G320
* Title: macOS Monterey, Version: 12.6.1, Size: 12108491KiB, Build: 21G217
* Title: macOS Monterey, Version: 12.6, Size: 12104042KiB, Build: 21G115
* Title: macOS Big Sur, Version: 11.7.2, Size: 12119307KiB, Build: 20G1020
* Title: macOS Big Sur, Version: 11.7.1, Size: 12119247KiB, Build: 20G918
* Title: macOS Big Sur, Version: 11.7, Size: 12118755KiB, Build: 20G817
* Title: macOS Big Sur, Version: 11.6.6, Size: 12121263KiB, Build: 20G624
* Title: macOS Big Sur, Version: 11.6.5, Size: 12121404KiB, Build: 20G527
* Title: macOS Big Sur, Version: 11.6.4, Size: 12147782KiB, Build: 20G417
* Title: macOS Big Sur, Version: 11.6.3, Size: 12143674KiB, Build: 20G415
* Title: macOS Big Sur, Version: 11.6.2, Size: 12141944KiB, Build: 20G314
* Title: macOS Big Sur, Version: 11.6.1, Size: 12137180KiB, Build: 20G224
* Title: macOS Big Sur, Version: 11.5.2, Size: 12149332KiB, Build: 20G95
* Title: macOS Catalina, Version: 10.15.7, Size: 8055650KiB, Build: 19H15
* Title: macOS Catalina, Version: 10.15.7, Size: 8055522KiB, Build: 19H2
* Title: macOS Catalina, Version: 10.15.6, Size: 8055450KiB, Build: 19G2021
* Title: macOS Mojave, Version: 10.14.6, Size: 5896894KiB, Build: 18G103
* Title: macOS High Sierra, Version: 10.13.6, Size: 5099306KiB, Build: 17G66
softwareupdate --fetch-full-installer --full-installer-version 12.6.2
-
Or use Mist or sus-inspector
-
For MacPro5,1 use this:
softwareupdate --fetch-full-installer --full-installer-version 10.14.6
cp /Applications/Install\ macOS\ Mojave.app/Contents/Resources/Firmware/MP51.fd ~/Desktop
- Catalina use the latest security update
- Mojave use the latest security update
- High Sierra use the latest security update
pkgutil --expand [Double click the dmg file and drop file here] /destination/path/
pkgutil --expand /Volumes/macOS\ Catalina\ Security\ Update\ 2021-008/SecUpd2021-008Catalina.pkg ~/Desktop/Expanded
cp ~/Desktop/Expanded/FirmwareUpdate.pkg/Scripts/Tools/EFIPayloads/MM61.scap ~/Desktop/MM61.scap
Please check here for the latest firmware version and the latest full installer version or latest security update.
- Mounting Big Sur SharedSupport disk image:
/usr/bin/hdiutil mount /Applications/Install\ macOS\ Big\ Sur*.app/Contents/SharedSupport/SharedSupport.dmg
- Store ZIP file path to variable (handle unpredictable file name)
ZIP_FILE=`ls /Volumes/Shared\ Support/com_apple_MobileAsset_MacSoftwareUpdate/*.zip`
- List firmware files in ZIP file:
unzip -l-qq "$ZIP_FILE" "AssetData/boot/EFI/EFIPayloads/*"
- In Terminal.app, first verify your EFI version using the following command:
/usr/libexec/firmwarecheckers/eficheck/eficheck --integrity-check | grep "EFI Version"
-
Note:
macOS Sonoma
no longer prifides theeficheck
utility. That has been removed fromSonoma
. All T2 and Apple silicon models automatically check the integrity of their firmware in the early part of the boot process anyway. -
locate the firmware file and store the exact file path into the variable FIRMWARE_FILE:
FIRMWARE_FILE=<firmware file path here>
- An example command would be:
FIRMWARE_FILE=AssetData/boot/EFI/EFIPayloads/MBP112.scap
- Extract the firmware file ( "-j" means don't create directory structure and "-d" designates that output directory):
unzip -j "$ZIP_FILE" $FIRMWARE_FILE -d ~/Desktop/
- Set your MacBook to upgrade the firmware on the next bootup (SIP must be disabled). Fill in the file name of your specific firmware file:
sudo /usr/sbin/bless -firmware ~/Desktop/<firmware file name here> --verbose --recovery
- Trigger firmware upgrade: Shut down your computer. (Do not choose the restart option!) After the MacBook is powered off, power it back on by pressing the power button. Next be patient, and if everything goes well your firmware will be updated.
Hi
I'm curious if this would could aid in downgrading an ibridge version, either through DFU Restore and/or imbedding in a legacy installer or even flashing? Forgive my verbiage/naivety as I'm just learning about all of this. I know there aren't any signed ibridge versions that go back as far as I need (10.13.6) but I'm not clued in as to how the ibridge version works with an installer.
I'm on an intel T2 iMac Pro, trying to revert back to the OS it was originally shipped. Since I bought it refurbished, I had just been updated to the latest OS + ibridge version, which will only allow Mojave 10.14 or newer to be booted to, internally or externally. And or course I'm trying to get to High Sierra 10.13. I had almost completely accepted defeat over the last few weeks after numerous failed attempts to find a work around until I saw this page. I know it's been done before but I haven't found anyone who has RECENTLY successfully downgraded to 10.13 after updating to the current OS/Ibridge v.
Do you think this tool be used in my situation? Any insight is very much apprecaited