Install Osx High Sierra From Usb

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Step 1: To begin, download macOS High Sierra 10.13 installer app from the Mac App Store. The app will be titled, “Install macOS High Sierra”. Step 2: Connect the aforementioned USB flash drive to your Mac, and then launch the Disk Utility app to format the connected flash drive. Once the app opens, make sure that it is selected in the left. Learn how to clean install your MacBook Pro from USB with macOS High Sierra.Part 1 - SanDisk Ultra 2 - Bootable USB-Stick (2:51. Once you create a bootable High Sierra USB installer, it’s time to install your macOS. Before installing macOS High Sierra from a USB, make sure to back up your important data first as this process will erase all the main drive’s data. To install High Sierra from a USB using your startup disk drive: 1. Go to System Preferences.

Install Osx High Sierra From Usb
  • Or use the OS X installation disc that came with your machine — or buy a new one — to boot up and install OS X on your Mac’s hard drive. Related: How to downgrade from macOS Mojave to macOS High Sierra; Factory reset MacBook Air and other Macs with macOS; How to create a macOS Catalina USB installer; macOS could not be installed, how-to fix.
  • Here just go to Tools-Download macOS High Sierra as shown in the below image. Download Full High Sierra Installer. It will ask you to select a location to save the macOS Sierra Installer. Select the location and it will start downloading. The file size is more than 5GB is it may take a long time depending on your internet speed.

Everyone knows that Apple signs the firmware of its mobile system for the iPhone and iPad. But few people know what turns out to be, she signs the macOS desktop system, and if you want to install a version that is no longer signed, you will receive a message with approximately the following content:

“Application is damaged, can’t be used to install macOS”

Install Os X High Sierra On Usb Drive

Here some ways for fix this trouble.

Fix Installation macOS Errors

In this case, you have two solutions:

  • download the latest image of the desired system from the Mac App Store and recreate the bootable USB flash drive;
  • change the date of your Mac to the one that preceded the release of the build with macOS(OS X).
Install Osx High Sierra From UsbInstall os x high sierra on usb drive

If the first method requires more time and effort from you, then the second can be done directly in the installer mode without restarting the Mac.

Read more: What is “Copy Error Code 0” Means in macOS?

Fix macOS Installation Errors with Terminal

All that will be needed is to launch the Terminal program and use it to change the date. Change the date a few days before the update is released so that it works. macOS release dates can be viewed on the Wikipedia website.

Install

How to use the Terminal to change the date in the macOS installer:

  • In the menu bar, click “Utilities” and select Terminal;
  • You can view the set date using the command:
  • In order to change it, you need to add the date to the date command in the format: mmddHHMMyy

Install Os X High Sierra From Usb

mm – month (01-12);

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dd – date (01-31);

HH – hours (00-23);

MM – minutes (00-59);

yy – year.

For example, 20:31 on January 9, 2014 will look like this: date 0109203102014

Install Osx High Sierra From Usb

Conclusion

This is not really a panacea, but when I came across a similar problem it helped me reinstall macOS Sierra. After the steps have been taken, you will no longer have an error and you can safely install macOS. You can download and install the latest updates already in the system itself.