Why my Startup Manager does not appear when I hold the Option key when starting to boot.
I no longer have the Startup Manager appearing when I hold the Option key when starting to boot.
Instead, the system just boots into whichever OS was last selected in the Startup Disk Preference.
How to get back my Startup Manager so that I can boot up from my external hard disk.
Thank you.
Can you please run the following in terminal and post the output in your reply:
diskutil list; echo; nvram -p | grep boot-args; echo
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