![]() ![]() I don't know why either, maybe there was a problem updating the firmware. There may have been another way, but I couldn't figure it out. Sorry Dan, altering the date via terminal was a lost of time. I then had to open the iMac again, swap the SSD for the HDD again, and then I could do a fresh 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. Here is a definitive guide on how to install macOS High Sierra on a non-startup drive: 1. The issue appeared when I went to do a clean install of High Sierra on the new SSD. Once it’s done downloading, the installer will attempt to run but you’ll. Since you’re running Mojave, clicking Get will launch the new Software Update interface in System Preferences and start downloading the approximately 5.2GB High Sierra Installer. ![]() El Capitan 10.11, High Sierra 10.13, Sierra 10.12. This should take you to the macOS High Sierra page in the Mac App Store. 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. DisplayLink Manager is a new way to enable your DisplayLink dock, adapter or monitor on macOS platforms. When High Sierra does boot, youll need to go through choosing your country, setting up a user, and the rest of the initial setup process. If that doesnt happen, try ejecting the ISO from the Virtual Machine. The reason why is because I pulled a failing HDD from the Mac that only had Yosemite installed. Eventually the virtual machine will reboot again, this time into macOS High Sierra. Shift-Option-Command-R: When you press and hold. Option-Command-R: When you press and hold these three keys at startup, macOS Recovery might offer the latest macOS that is compatible with your Mac. I could install earlier OS versions, but not High Sierra. Command-R: When you press and hold these two keys at startup, macOS Recovery will offer the current version of the most recently installed macOS. I have personally had a firmware issue on an iMac that prevented me from installing High Sierra to an non-Apple SSD. ![]() The Mac must also be using macOS High Sierra or later, the latest version of macOS Sierra or the latest version of OS X El Capitan.Click to expand.I don't know why either, maybe there was a problem updating the firmware. To download an installer suitable for creating a bootable installer, use the App Store or use a web browser to download from a compatible Mac. Follow the onscreen installation instructions.Ī bootable installer can be useful if you want to install macOS on multiple computers without downloading the installer each time, or when you can’t install using the other methods. This will be the clean macOS install onto the freshly erased hard drive. Open your Applications folder and double-click the macOS installer, named Install. Back at the macOS Utilities screen, choose Install macOS to install a new copy of macOS High Sierra. pkg file, then follow the onscreen instructions to install the macOS installer into your Applications folder. Recently I was using Catalina with no 'major' problems, the computer gets hot just by using Chrome etc. It seems that how much memory I have, the systems just wants to use it all. So I bought 8gb of ram and a brand new ssd. dmg file to open it and see the package (.pkg) file within.ĭouble-click the. Use the tool only to download high sierra. Im thinking of upgrading the Catalina partition to Big Sur. High Sierra is my primary OS I use Catalina for programs that will no longer run on HS (e.g., Turbo Tax). Use these links to download a macOS disk image (.dmg) file.ĭouble-click the. Im currently dual-booting High Sierra and Catalina on a 2014 MacBook Pro without issues.
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