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I want to startup from an external disc (2019 iMac-Catalina). When I go to recovery mode and startup utility, I get the choice to require a password to change firmware but no other choices to allow external disk boot. That whole section is simply missing.
iMac Line (2012 and Later)
Hello duguyishe,
Welcome to the Apple Support Community! We understand your iMac is not allowing you to boot from your external disk. We're happy to help! First we'd recommend taking a look at the reference below:
How to select a different startup disk
If you need further help after reviewing above let us know.
Thanks!
A 2019 iMac doesn't have a T2 chip, so it doesn't have those options.
Thank you so much. I had just assumed that it did and it was driving me nuts do not see the choices.
Startup security utility lacks choices
