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When you hear the startup chime, press and hold the Option key. Holding that key gives you access to Startup Manager. Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content.
这个答案有帮助吗？
Thanks, I know about the option key thing. What I'm looking for is a way to create an external boot/startup thumb drive.
Easy way use this free program https://diskmakerx.com/, from another working mac you can create it, the only thing that you need is a macOS installer that you can search online for it, due that is old may you will have a hard time.
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