![]() Generally, the latest version supports only the latest version of macOS if you want to install something older than macOS High Sierra, check the list of older versions and download one that's compatible with your chosen operating system. I don't know why either, maybe there was a problem updating the firmware. The simplest way to create a boot USB drive is to download DiskMaker X and use it to create your drive. It should now boot into Unibeast and give you the option of which drive to install from. There may have been another way, but I couldn't figure it out. Plug in the USB stick on which you installed Unibeast and restart your PC. Booted into Internet Recovery Mode to do clean install. Checked date in Terminal (it's correct) 2. Step Five: Install macOS High Sierra on VMware. Step Four: Edit Virtual Machine file with Notepad. Step Two: Install VMware Unlocker for macOS (Unlocker for VMware) Step Three: Set up a New Virtual Machine on VMware. Got the first message that said 'The recovery server could not be contacted. Step One: Install VMware Workstation or Player. I then had to open the iMac again, swap the SSD for the HDD again, and then I could do a fresh install. First booted into Recovery Mode and wiped internal drive to do clean install. To install High Sierra on the third-party SSD, I had to open the iMac again, put an OEM Apple HDD back, install an OS before high Sierra, then upgrade to High Sierra, installing the Firmware in the process. I forget the exact message, or if there even was one, but I think I wasn't even able to start the install process because the SSD showed as greyed out on the installer when picking the installation drive. The issue appeared when I went to do a clean install of High Sierra on the new SSD. I swapped with a third-party SSD and cloned the OS from another Mac I had and was running High Sierra on it just fine. The reason why is because I pulled a failing HDD from the Mac that only had Yosemite installed. I could install earlier OS versions, but not High Sierra. ![]() If you have OS X 10.12 (Sierra) or older use this line instead. The app store installer does the exact same thing. If you already have Xcode installed, do not install OSX-GCC-Installer. I have personally had a firmware issue on an iMac that prevented me from installing High Sierra to an non-Apple SSD. Fine, whatever, Ill just download a new one from the app store. ![]() Click to expand.I don't know why either, maybe there was a problem updating the firmware.
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