If the second box ( Download the latest Windows support software from Apple) isn't grayed out, check it. In Boot Camp, click Continue, and check the box to Create a Windows 10 or later install disk. This is it, you have a bootable OS X usb drive. Launch Boot Camp on your Mac you can do this from Applications > Utilities in Finder or by using Spotlight. From the first iso, obtained on step 3, copy BaseSystem.chunklist and BaseSystem.dmg on the thumb drive (actually, the latter might not be necessary - but it worked for me at this step and I stopped experimenting). Mount the thumb drive (you might need to apt-get install hfsprogs to mount an HFS filesystem).
In my case (High Sierra 10.13.6), 4Gb stick was sufficient, even though createinstallmedia requires 8Gb. iso as well ( dmg2iso -i BaseSystem.dmg -o BaseSystem.iso)Ĭopy it to a thumb drive: dd if=BaseSystem.iso of=/dev/sdX BS=1M. iso įind BaseSystem.dmg in the mounted image. Open App Store on your Mac and search for the macOS. You can do it from GUI (right click, "Open with disk image mounter") or something like mount -o loop. In order to create a bootable USB drive for Mac, you need to download macOS installer file. So, you'll need to find an alternative source.Ĭonvert. This question on apple support has all the links, but they are only accessible from OS X (if you had access to a live OS X at this point - you probably would've just used createinstallmedia already, right?). Unlike El Capitan, High Sierra only needs BaseSystem.dmg, which also has enough free space to boot - so, the process overall can be simplified a bit.
So, leaving it here in case somebody else will need to. I recently had to make a High Sierra 10.13.6 bootable USB drive, and the process turned out a bit more involved that just dd-ing the dmg2img-generated ISO to a thumb drive.
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