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54 lines
2.6 KiB
Markdown
54 lines
2.6 KiB
Markdown
# Download and build macOS Installers
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* [Downloading](#downloading)
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* [Building](#building)
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This doc is centered around downloading and writing the macOS installer to a USB. If you're already familiar with how to do this, you can skip.
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* Note: 16GB+ USB will be required for the installer
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## Downloading
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The simplest way to download macOS installs would be to use installinstallmacos:
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```sh
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mkdir ~/macOS-installer && cd ~/macOS-installer && curl -O https://raw.githubusercontent.com/munki/macadmin-scripts/main/installinstallmacos.py && sudo python installinstallmacos.py
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```
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As you can see, we get a nice list of macOS installers. If you need a particular versions of macOS, you can select it by typing the number next to it. For this example we'll choose 10:
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This is going to take a while as we're downloading the entire 12GB+ macOS installer.
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Once finished, you'll find in your `~/macOS-Installer/` folder a DMG containing the macOS Installer, called `Install_macOS_11.1-20C69.dmg` for example. Mount it and you'll find the installer application.
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* Note: We recommend to move the Install macOS.app into the `/Applications` folder, as we'll be executing commands from there.
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* Note 2: Running Cmd+Shift+G in Finder will allow you to easily jump to `~/macOS-installer`
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## Building
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Now we'll be formatting the USB to prep for both the macOS installer and OpenCore. We'll want to use macOS Extended (HFS+) with a GUID partition map(Using GUID is important for the patcher). This will create two partitions: the main `MyVolume` and a second called `EFI` which is used as a boot partition where your Mac's firmware will check for boot files. `EFI` partitions will be hidden by default, so don't worry if you don't immediately see them.
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* Note: By default, Disk Utility only shows partitions – press Cmd/Win+2 to show all devices (alternatively you can press the View button)
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Next run the `createinstallmedia` command provided by [Apple](https://support.apple.com/en-us/HT201372). Note that the command is made for USB's formatted with the name `MyVolume`:
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```sh
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sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume
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```
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* Note: You can also replace the `createinstallmedia` path with that of where your installer's located (same idea with the drive name).
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# Once finished, head to [Building and installing OpenCore](./BUILD.md)
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