Creating High Sierra Bootable Flash Disk

-login to your AppleStore and leave it connected
-Download macOS High Sierra Patcher Tool from
run it
click Tools/Download macOS High Sierra and save it to Applications
when Download Complete, click Not Now

-insert 16GB flash disk
# sudo /Applications/Install\ macOS\ High\ –volume /Volumes/YourUSBStick –applicationpath /Applications/Install\ macOS\ High\
Reboot and hold Option key then choose “Install macOS High Sierra” disk

Must format target disk with GPT
After boot from USB, run Terminal from Utilities menu
Why I need to use Terminal because sometime DiskUtil GUI can’t change Partition type
# diskutil list
note target disk
# diskutil partitionDisk /dev/disk1 GPT JHFS+ TARGETDISK 0b

error “The recovery server could not be contacted”
open Terminal
# ntpdate -u

error “This copy of the Install macOS High application is damaged, and can‘t be used to install macOS.”
# rm /Volumes/Install\ macOS\ Sierra/Install\ macOS\ High\

  1. Find the installer in USB.
  2. Right click on the installer and click “Show Package Contents”.
  3. Click on the folder named “Contents”.
  4. Click on the folder named “SharedSupport”.
  5. Delete the file named “InstallInfo.plist”.
  6. Enter your administer password to confirm.
  7. Now open the installer.
-By default High Sierra hiding drive icon on Desktop
open Finder Preferences
click General
tick Hard disks

-System Extension Blocked
click Open Security Preferences
click General. click Allow

-Modify or creating any files or folders on a disk, it will asks Admin password
  1. From the Finder menu bar, choose Go > Home. Your home folder opens.
  2. Choose File > Get Info. An Info window for your home folder opens.
  3. If the Sharing & Permissions section at the bottom of the window isn’t open, click the triangle  in that section to open it.
  4. If the Lock button at the bottom of the window shows a closed lock  , click the lock and enter an administrator name and password.
  5. Click the Action menu  in the bottom corner of the window, then choose “Apply to enclosed items.” Click OK to confirm the action. A progress bar appears at the top of the window.
Right click disk and choose Get Info
Scroll all the way down and click Lock icon, type Admin password
Tick Ignore ownership on this volume

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