Apple also provides an option for internet recovery of macOS if your computer fails to boot. The online OS update is OK if you have stable broadband connectivity and enough bandwidth. Be it a clean install or upgrade, Mac App store require you connect to the internet to download whole installation files. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.Internet connection (for Touro feature updates) Mac: Computer system running with Mac OS® 10.5 or newer and an available USB 3.0 or USB 2.0 port Intel® processor-based Macs only Internet connection (for Touro feature updates and Customers get Software upgrades for Mac computers through the online app store ever since the release of macOS Lion. Click on the Erase tab in the DU main window. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list.And you need to download a full-size macOS installer for making this disk. Two levels of secure backupInstalling macOS without internet requires a bootable USB disk. Remote access anytime, anywhere Cloud backup enables simple remote access, anytime, anywhere. Upgrade for more cloud storage Upgrade to a premium account and receive 250 GB of cloud storage. Having a macOS offline installer or a bootable USB disk is the only solution in such scenarios.USB 3.0 interface Delivers a faster transfer speed for all your photos, movies, music and documents.For macOS versions up-to Big Sur, you need to use another script “ BuildmacOSInstallApp.command” in the main folder to join all the downloads and make the full macOS installer app. A new folder “macOS downloads” appears in the “ gibMacOS-master” as you provide a download option, and the OS starts downloading as you can see in the video.The OS gets downloaded as parts, PKGs, DMGs and other files. You can use this script to download macOS Big Sur (11.1), Catalina (10.15), Mojave (10.14), and High Sierra (10.13.6). When the list is ready choose a number as per your OS option and press the Return/Enter key. Support for USB 2.0 and USB 3.0 devices, VirtualBox RDP, disk encryption.Wait for the script to fetch the macOS download catalogue from Apple. From the extracted folder, run the script called gibMacOS.command — it will open the Terminal as shown below.Note: After upgrading VirtualBox it is recommended to upgrade the guest.
![]() Next is setting the USB pen drive for creating the bootable installer. Select “Use this Copy” if you would like to proceed with it. The application will automatically detect the downloaded macOS as shown in the screenshot. Run Disk Maker DMG installer and copy the app to the Applications. The next step is to download full macOS installer from the App Store to your Applications folder. Hence, I’m downloading disk maker X 7. Ignore the warning message and proceed to Erase and Create macOS USB disk. Pick the one you would like use as macOS USB installer. The app will list all drives in your system. Usb 3 Manual Method ToCheck the instructions on Apple website, the manual method to make macOS offline USB installer.What is the alternative if I don’t have usable Mac at the moment?This method is applicable when you have a Mac, and the internet recovery fails. Unmount and keep the USB installer to a safe place.Unfortunately, the above app is not compatible with macOS Big Sur 11 and above. When it completes you will find Install macOS Mojave (or High Sierra) mounted to your desktop as a USB disk. Keep checking notifications tab for progress. Retrieve data on external drive formatted for macsays initalizeThe Mac will then display all the startup disks available.Pick the USB drive starting with the label “Install macOS” and follow on-screen instructions to complete the installation. Just connect the USB disk and press the Option/Alt Key when you hear the boot sound. Clean installing or restoring a Mac offline with USB pen driveAs said earlier, you could use the macOS USB installer to do a clean install or restore it upon a boot failure. If you have a macOS DMG, you can create bootable USB disk from a Windows PC — use a software like TransMac for this purpose.
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