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ERROR on Terminal doing a Bootable Flash Drive with macOS High Sierra

Good afternoon, @tdunc15 - I hope you are great brother ! I have a new adventure.. I am trying to make a bootable Flash Drive with macOS High Sierra, but there is two issues that it is happening and are the nexts:

a). The computer where I wish to install it supposedly is an unsupported machine (But I’ve have found on internet, that even this it could be installed, by the way).

The specs of my Computer is:

iMac 21.5 Inches. (Late 2009)

System installed: OS X Yosemite ( Version 10.10.5 )

Processor: 3.6 GHz Intel Core Duo

Memory: 4 GB 1067 MHz DDR3

Hard Drive: 500 GB

Graphic Card: NVIDIA GeForce 9400 256 MB

b). ' Through the Terminal ( On my Computer ) I was trying to make the bootable Flash Drive with macOS High Sierra, but the process fails . I don’t know why, because I’ve done all the steps to create it. I have a 8GB Flash Drive [ Already Formatted by Mac OS Extended (Journaled) ]. Also, I’ve Downloaded the Software from the App Store.

The next message Shows Up on the Terminal while I am trying to do it:

Last login: Sat May 12 18:04:25 on ttys000

DAVIDs-iMac:~ davidson $ sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS\ High\ Sierra\ \(Bootable\ Drive\) --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

Ready to start.

To continue we need to erase the volume at /Volumes/macOS High Sierra (Bootable Drive).

If you wish to continue type (Y) then press return: Y

Erasing Disk: 0%... 10%... 20%... 30%...100%...

Copying installer files to disk...

Copy complete.

Making disk bootable...

Couldn't mount dmg /Volumes/Install macOS High Sierra/Install macOS High Sierra.app/Contents/SharedSupport/BaseSystem.dmg (error code 110)Mount of BaseSystem failed.

Done.

DAVIDs-iMac:~ davidson$

Additionally, I am showing some images that maybe could help you to identify any information you may ask:

• Format and Capacity of the Flash Drive.

Block Image

• An image that shows the how looks inside when I open to see the Content on the Flash Drive after the process failed. Also, an image that shows how looks the icon of the Flash Drive on the Desktop.

Block Image

Block Image

• Information about the Wifi specs.

Block Image

Thank you so much in advance !!

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1 Solução

Solução escolhida

1) Make sure you actually quit Disk Utility and all other Finder windows relevant to what you are doing.

2) Instead of sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/macOS\ High\ Sierra\ \(Bootable\ Drive\) --applicationpath /Applications/Install\ macOS\ High\ Sierra.app, break this out into 2 separate commands

a) first "sudo su"

b) then without "sudo", the rest of the command.

Note: when you format the drive you intend to make a bootable installer, call it "Untitled". OS X createinstallmedia will change the name later. So the command would look like

/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ High\ Sierra.app

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Thank you so much ! @avanteguarde - I'll try to do exactly what you are suggesting to me. I'll let you know the result once I have done this.

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i tried that and i get this message /Applications/Install macOS High Sierra.app does not appear to be a valid OS installer application. think you can help

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David será eternamente grato(a).
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