AccurateIsaiah Posted June 17, 2021 Share Posted June 17, 2021 Hello. I am trying to make a Big sur iso following this guide: But it seems like it is outdated and the BaseSystem.dmg is missing The files I have downloaded are BuildManifest.plist Info.plist InstallAssistant.pkg InstallInfo.plist MajorOSInfo.pkg UpdateBrain.zip Any workaround to this? Quote Link to comment Share on other sites More sharing options...
Rocky12 Posted June 17, 2021 Share Posted June 17, 2021 https://www.wikigain.com/download-macos-big-sur-beta-iso-image/ How to Create a MacOS Big Sur ISO File We will be focusing on making an ISO file for macOS Big Sur, but you can use this same approach for making an ISO file of MacOS Catalina and macOS Mojave too. hdiutil create -o /tmp/MacBigSur -size 12500m -volname MacBigSur -layout SPUD -fs HFS+J hdiutil attach /tmp/MacBigSur.dmg -noverify -mountpoint /Volumes/MacBigSur sudo /Applications/Install\ macOS\ Big\ Sur/Contents/Resources/createinstallmedia --volume /Volumes/MacBigSur --nointeraction hdiutil detach /Volumes/MacBigSur/ hdiutil convert /tmp/MacBigSur.dmg -format UDTO -o ~/Desktop/MacBigSur.cdr mv ~/Desktop/MacBigSur.cdr ~/Desktop/BigSur.iso Get the MacOS Installer application that you wish to use: For MacOS Big Sur, macOS Catalina and MacOS Mojave, go to the Mac App Store (or use this method to download full macOS installers) and download the installer applications for the macOS version you wish to make an ISO file of The MacOS installer app should be in the /Applications folder and be labeled as “Install macOS Big Sur.app” or similar, keep it there and make note of the file name Next launch the Terminal application by hitting Command+Spacebar and typing “Terminal” and hitting the return key, or by launching it directly from the Utilities folder First, we must create a temporary disk image: Next, mount the disk image: Now we’ll use the createinstallmedia utility that is part of the MacOS Installer application to copy the installer files to the disk image you just created: Hit return and enter the admin password to authenticate, let this process complete as it makes the installer that will turn into the ISO. When finished, we then unmount the disk image volume: Next, we’ll convert the freshly created MacOS Installer disk image file to a CDR / ISO file that will appear on the desktop: Finally, we change the file extension from .cdr to .iso: Quote Link to comment Share on other sites More sharing options...
Rocky12 Posted June 17, 2021 Share Posted June 17, 2021 1 Quote Link to comment Share on other sites More sharing options...
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