![]() To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS. Once your installation files have been copied, it's time to install macOS from scratch. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. Sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer You can find out which Mac you have by clicking on the Apple logo in the top-left corner and selecting "About This Mac" to see the name and year of release. If you're not sure what your Mac came with, head to Apple Support and search for your exact model. Your Mac's "earliest" supported version of macOS is the one that it came with. ![]() Older versions were written for Intel chips, which use the x86_64 instruction set, while the newer Apple Silicon chips use the ARM instruction set. It's common knowledge that new macOS releases often drop support for older hardware, but the same is true for newer Mac models and older software, too.įor example, you cannot install any version of macOS prior to Big Sur (released in 2020) on a Mac with an Apple Silicon chip, including the M1. It's important to understand that not all versions of macOS (or Mac OS X) work with all hardware configurations. Mine still have a small 'spinner', but will likely get a 250 GB SSD soon (they are only like $30).While the process is pretty straightforward, getting your hands on older releases of macOS isn't so easy. If you have an older MBP with a SSD and a decent amount of RAM (my guess 4 GB), it'll be a nice machine. Last night I reinstalled SnowLeopard (from USB) on my old MBP 2006 (in order to start off with a clean drive) and it worked flawlessly. Hold down Option during boot up and select the USB. The file size is 5.8 GB, so the download may take a while, depending on the speed of your Internet connection. Download the El Capitan installer from Apple. Here's how to get older SW (long but good article): Īnd once the DMG file (I think it works just as well with an ISO image) on the USB, you can boot off that one (or burn the DMG to a DVD and boot from there). If your Mac is running OS X Lion or Mountain Lion, follow these steps to upgrade to El Capitan. My guess is that you can possibly go all the way up to El Capitan w/o issues. I also have a 2006 MacBook Pro, upgraded that one from Tiger to Snow Leopard using a USB, so your should work fine as well. Once installed on your SSD, don't forget to enable TRIM: I have an iMac from early 2008 (with a SSD), fresh install with Snow Leopard from a USB on that one and upgraded to El Cap via the app Store (possible as of Snow Leopard). OS X Mountain Lion (version 10.8) is a major update for Apples macOS, the operating system used on Macintosh computers. ![]() EDIT: I'm pretty certain it is hold down the 'Option' key on boot up!!Then run DiskUtility from the Snow Leopard installer to fully erase and format your SSD before installing Snow Leopard (or ML if you start there). Think the correct command for your is 'Press C" but unsure as it has changed a bit depending on HW version ( ) If not accurate, Google boot key command. Make a bootable USB: or or if you have ML (just saw that) you can put that on a bootable USB drive as well.īoot Mac from USB and run install. Here is a link for official download of Lion: \_US Download SnowLeopard: (there should be an official Apple link these days as well, as Apple last year sometimes put all their versions of OSX - even the ones you had to pay for in the past - online for free downloads).
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