My friend got a new MacBook Pro from office, later on he resigned and in a hurry erased the "Macintosh HD", now we are trying to install Mojave using Bootable USB but it won't allow because "External Boot" is not allowed, also when we try to access "Startup Security Utility" it shows an error saying no administrator was found, so we can't enable "Allow booting from external media". Somehow online installation from recovery mode is also not working and throws 202 error at the end. Is there any luck?

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  • Hey there, Welcome to Apple.SE! I don't have administrator account on my mac is it helpful? – ankiiiiiii Jul 11 at 18:52
  • The system was probably a part of a managed system and needs to be removed from that system. Presumably by their former workplace IT folks. – Steve Chambers Jul 11 at 18:54
  • @ankiiiiiii thanks! but as I mentioned there is no OS on MacBook right now, so how would it boot to "Single User Mode"? Or will it? – Hadi Jul 11 at 18:55
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    @SteveChambers He was given boxed pack MacBook Pro, so he's the first user. – Hadi Jul 11 at 18:56

You need to take it to an Apple Store. The SecureBoot settings can't be changed unless there is a valid admin user, so you can't boot to an external. Recovery is your only other option, and that's not working.

I had a similar issue with my 2018 Mini: I had to run the "Welcome to Mac" routine and create a new user before I could alter SecureBoot, even though the disk had been imaged with an admin user. I suspect the T2 chip needs to be informed.

PS. I'd love to work somewhere where you get to keep your laptop when you resign!

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