How to Install macOS Sonoma on Unsupported Macs

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Reboot to boot disk selection

After OpenCore finish the installation, you will get prompted to reboot.
Before rebooting, be sure to have both the EFI USB and the MacOS installer USB inserted in your Mac.
While the Mac is rebooting, hold the option key to enter boot disk selection.
You can reboot normally, then shut down your Mac and turn it back on while holding down the [option] key.

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