# Booting the USB
For those unfamiliar with drive booting in macOS, there's a few ways to handle this:
- Hot Key Combo
- Recommended for most users
- Bless Command
- Recommended for users with problematic GPUs(ie. Mac Pros without a flashed GPU ROM or iMacs with upgraded GPUs)
# Hot Key Combo
From here, reboot your machine with the USB plugged in then press and hold the
Option key on your Macs until you hear the chime. From here, you should get a GUI like this:
Here you'll want to select the
EFI Boot entry, as this is our OpenCore install. Once selected you should plop here:
From here, you can now boot the "Install macOS entry"
# Bless Command
Inside macOS, there's a command called
bless. This is used to "bless" a bootloader or drive to make it the next default boot option, which is quite important for systems where you can't see which drive you want to boot.
To bless a drive, open up terminal and run the following:
# The below commands require SIP disabled # This also requires the EFI partition of our USB to be mounted sudo bless --verbose --file /Volumes/EFI/EFI/OC/Bootstrap/Bootstrap.efi --folder /Volumes/EFI/EFI/OC/Bootstrap --setBoot # From here, reboot the machine sudo shutdown -r now
Once rebooted, it should now boot OpenCore and you should get this screen:
# Bless troubleshooting
Unfortunately some GPUs GOP are so problematic that they still won't work correctly within OpenCore. To resolve, we'll want to run the BootKicker application in our EFI:
# The below commands require SIP disabled # This also requires the EFI partition of our USB to be mounted sudo bless --verbose --file /Volumes/EFI/EFI/OC/Tools/BootKicker.efi --folder /Volumes/EFI/EFI/OC/Tools --setBoot # From here, reboot the machine sudo shutdown -r now
Once BootKicker is run, your GPU should be able to boot OpenCore with ease.