![]() ![]() If you upgrade and find that you don’t like the new version of macOS, or if there are issues with application compatibility, you can simply revert to your bootable backup and be back up and running with the old operating system in a matter of minutes. This not only makes normal system recovery much easier, but it also allows you to grab a “snapshot” of your system just before major macOS upgrades. Using an app like Carbon Copy Cloner or SuperDuper you can create full bootable backups of your drive. Then back up all of your data, boot to the USB installer and use Disk Utility to erase the drive, and then install High Sierra from scratch.įor those who don’t like the sound of that, but still fear needing to downgrade, one forward-looking solution is to get into the habit of creating bootable backups of your Mac’s primary drive. To do so, you’d need to use the steps above to download the High Sierra installer and create a bootable USB. You see, there’s no built-in, official way to downgrade nondestructively from one macOS version to another. Reasons for doing so may include downloading an installer for another Mac that has limited or no Internet access, troubleshooting another Mac that won’t boot, or even creating a bootable installer for the purpose of downgrading your own Mac if you find that software you rely on has incompatibilities with the latest version of macOS. While Apple would justify this limitation in the name of simplifying things for consumers, the fact remains that many users may still need to download an older version of macOS at some point. The idea is that once you upgrade to the latest version of macOS there’s no going back to using an earlier version. For example, once you’re running macOS Mojave, you won’t see the macOS High Sierra page listed in the Mac App Store, nor will it show up in App Store search results. Otherwise it won't detect Metal properly.How to Download macOS High Sierra From macOS MojaveĮver since Apple started using the Mac App Store to distribute operating system updates, the company hasn’t made it particularly easy to access older versions of macOS. IMPORTANT: Make sure to run Mojave installer directly from High Sierra, not from bootable USB stick. It's also recommended to perform Boot ROM update even if you plan to stay on older macOS version like High Sierra or older. If you plan to make a clean installation of macOS Mojave, make sure your partition is formatted as APFS filesystem and using GUID Partition Map. Then post updating the Boot ROM you no longer need it. Best would be to get some cheap HP GeForce GT630 2 GB or DELL GeForce GT640 1 GB/GTX645 1 GB for PC (doesn't need to be flashed with Mac rom). If your current card doesn't support Metal (like factory installed NVIDIA GeForce GT120, AMD Radeon HD4870, HD5770 or HD5870) and your new card is too new to have High Sierra support (like RX5000/RX6000 series), then you need a helper card. If you have NVIDIA card make sure to have the latest Web Driver driver installed which can be downloaded from Drivers page, otherwise installer would complain about Metal support or FileVault enabled: My graphics card is Metal capable, but macOS Mojave installer still complains about lack of Metal support. If your macOS High Sierra partition is still running HFS+ filesystem it will be automatically converted to APFS after macOS Mojave installation. We recommend performing Boot ROM update and macOS Mojave installation with no other PCIe cards installed and a SATA drive connected to one of the internal drive bays. ![]() fixes critical CPU security bugs like Spectre & Meltdown etc. ![]() adds support for PCI-Express 2.0 (5.0 GT/s link) for all PCI-Express 2.0 or faster cards instead of much slower PCI-Express 1.1 (2.5 GT/s link) You need to update Mac Pro 5,1 Boot ROM in order to install macOS Mojave 10.14 and newer unsupported systems like macOS Catalina 10.15, macOS Big Sur 11 or macOS Monterey 12. Installing macOS Mojave 10.14 and performing Mac Pro 5,1 Boot ROM update ![]()
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