![]() However, the USB is not recognized in System Preference (see Image 2 below). Under "How to create a bootable installer for macOS" section. So, I went back to the the upper directory of the article (). Your Mac will start up in Recovery Mode," because I did not see the bootable USB after restarting my Macbook Air while pressing the Option key. I was not able to implement Step 21 "Your Mac will display the Startup Manager, click on your external drive to select that as the startup disk. ![]() I skipped step 7 and finished the rest until step 20. I managed to place the downloaded High Sierra into the USB (see Image 1 below). According to instruction I got from MacWorld ()įollowing the instruction, I erased a USB (steps 1 - 6), but I was not able to implement Step 7 "Choose GUID Partition Map as the Scheme. ![]() Unable to view bootable start up USB from System Preference -> Start Up Disk I want to downgrade from Big Sur to High Sierra. ![]()
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