![]() ![]() The greater value for money story that Apple likes to tell customers is not borne out by my experience. Really not satisfactory that Apple can't produce newer operating systems that run properly on machines that are 4 years old. I have a bootable Mojave installer, but that consistently leaves the iMac hard drive with overallocation errors that, in the six months I've been trying to fix this, have led to hard disk corruption problems in the end. So now I'm on to your last suggestion, Internet Recovery and attempting to put Sierra on it. Both attempts resulted in the pictured error message towards the end of the process. I tried downloading the High Sierra installer from my iMac with the turgid Big Sur installation. In any case I'm puzzled why they wouldn't permit the downloading of an older OS and then run a script that blocks you from installing it on a new machine if you tried to do that by mistake. If Apple OS installer files were still disk images instead of apps that run scripts, this wouldn't be an issue. It's also bizarre that you can't use a newer Mac to help fix an older one. Would have been helpful if Apple's error message said that instead of 'not available'. Mac-pro-de-bernard-2:~ bernardbaz$ mv /tmp/ ~/Desktop/InstallSystem.Thanks for that pointer about not being able to download an older version. If you wish to continue type (Y) then press return: Y ![]() ![]() Mac-pro-de-bernard-2:~ bernardbaz$ sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/install_build dev/disk3s2 Apple_HFS /Volumes/install_build Mac-pro-de-bernard-2:~ bernardbaz$ hdiutil attach /tmp/ -noverify -mountpoint /Volumes/install_build Mac-pro-de-bernard-2:~ bernardbaz$ hdiutil create -o /tmp/HighSierra.cdr -size 5200m -layout SPUD -fs HFS J “Install macOS High Sierra” is busy and cannot be unmounted. Merci beaucoup Tyler, however at the last but one step (hdiutil detach) I got an error saying that disk3, i.e. If you wish to continue type (Y) then press return: yĬopying to disk: 0%… 10%… 20%… 30%… 40%… 50%… 60%… 70%… 80%… 90%…Įrror: Error Domain=NSCocoaErrorDomain Code=512 ““InstallESD.dmg” couldn’t be copied to “SharedSupport”.” UserInfo=The copy of the installer app failed. To continue we need to erase the volume at /Volumes/install_build. Sudo /Applications/Install\ macOS\ Mojave\ Beta.app/Contents/Resources/createinstallmedia –volume /Volumes/install_build I also got this error when creating the ISO file on step 3: ending with “Press ESC in 0 seconds to skip startup.nsh or any other key to continue. I use the Mojave.iso as the boot file, and I get this screen: “UEFI interactive shell” etc. The resulting ISO can be used to create bootable USBs, DVDs, install VMs, or simply to archive for your backups “just in case”.īut I am trying to use the ISO file I created to launch a virtual machine (10.13 Host, 10.14 guest). The resulting file on my desktop is almost ready to use. Here are some of my outputs for you to review (after the first three commands) Hdiutil convert ~/Desktop/InstallSystem.dmg -format UDTO -o ~/Desktop/HighSierra.iso Hdiutil detach /Volumes/Install\ macOS\ High\ Sierra Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/install_build Hdiutil attach /tmp/ -noverify -mountpoint /Volumes/install_build Run these commands one at a time ( Update :: I changed the 5130m to 5200m based on feedback from the comments) hdiutil create -o /tmp/HighSierra.cdr -size 5200m -layout SPUD -fs HFS J Overview of how to create a bootable macOS 10.13 High Sierra ISO image:Ĭlick this link to open the macOS High Sierra download in the App StoreĮspecially if you’ve already upgraded to high sierra and deleted the installer data (with CleanMyMac etc) you will need to download this again before proceeding with this article. This means you actually need a Mac or a MacBook to create this bootable ISO. To abide with Apple’s terms of use, you must go through official channels to obtain the macOS installer. This guide will also be useful for those who can run Virtual Machines of macOS in environments like VirtualBox etc. As an owner of a MacBook Pro, it’s slightly unsettling that I wouldn’t necessarily be able to plug in a bootable USB or insert a DVD with the macOS installer image in the event that I needed to re-install my OS because my SSD ate the dust, or something. OS X was a different story, but also you had to pay for those versions. Normally you can’t obtain bootable media of macOS. ![]()
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