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bomb52

macrumors newbie
Original poster
May 8, 2009
2
1
ORANGE COUNTY
Good morning every on. I have 2019 Mac Pro. I try to boot from usb to install window. Was hold option key but it didn't let me go to boot menu. I Already clear secure T2 Chip.
If some one have experience on this please let me know

thank you
 
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I did this a little while back when I was trying to work out how to boot into Linux to see what works and what doesn't. I didn't find it straight forward, and I think some experts may give you a better answer, but this is what I did (which is similar to what you've described, I think):

  • T2 Stuff
    • Went into Recovery Mode (CMD+OPTION+R)
    • Utilities-->Startup Security
    • I set Secure Boot=No Security (for booting Linux) but I think you can choose Medium if booting older MacOS version
    • Set Allow Booting from External Media = Checked
  • Booting Options
    • I tried to follow the instructions for booting into external drive using the Option key, but I clearly don't have that level of magical ability/dexterity, so I did this instead:
    • Ensure the USB or PCIe DISK you're trying to boot from is connected
    • System Settings-->General-->StartUp Disk-->Select that Disk
That worked for me on restarting. If you still don't have any luck. check you've made the bootable disk correctly. I say this, because I tried Belana Etcher (which looks simple enough) but I did something wrong. Then I tried a "dd" command example from Terminal, and this worked out fine.

That's all I've got for now, best of luck :) Otherwise, I'm sure there are smart folk that do this day in / day out that can point you in the right direction.
 
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Like others mentioned, make sure it’s a wired keyboard. Even something like a Logitech keyboard using its USB adapter might not work.

If you’re comfortable with using the Terminal in macOS and in macOS RECOVERY. You can set the bootloader to show up automatically. By stopping the auto bootup

[nvram manufacturing-enter-picker=true]

macOS recovery does not require sudo, but regular boot into macOS does. This is only cleared by you running the command again but with false instead of true. Or clearing the nvram back to default.

Be aware however that macOS and Window installs do multiple reboots when they’re being installed. This command while still set to true will ALWAYS. Stop the auto boot and you will have to select the correct install boot entry to continue.
 
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