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Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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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 !!

Answered! View the answer I have this problem too

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I have the same issue, using a 8gb flashdrive

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4 Answers

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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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Amigo me sale el mismo problema

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

Thank you, kind Sir!

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This did not work for me with the official image from Apple. However with a third party DMG download it did the trick. However, the installation failed, but that may be of other reasons than the DMG.. :)

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Try with another USB flash drive with more capacity (16GB or more).

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I am getting a different error here ““(error code 112)Mount of outer dmg failed.”” can any one suggest me what am i missing or doing wrong here.

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/ElCapInstaller --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

Password:

Ready to start.

To continue we need to erase the disk at /Volumes/ElCapInstaller.

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 OS X El Capitan/Install OS X El Capitan.app/Contents/SharedSupport/InstallESD.dmg (error code 112)Mount of outer dmg failed.

Done.

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You could be facing an expired certificate issue here. Here's more on that If you've got an old macOS install image, it will probably stop working today. While this is about Mojave to Sierra. This also hold true with older OS's as well. With El Capitan and other older OS-X releases we need to use a different method, here we need to takeout the installer telling it the year is within its install window. So we need to alter the systems clock setting to manual and then back date the year to lets say 2011. Then run the installer.

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Cool man this worked for me. If you've been grinding at the problem for a bit please make note of the bit where it says: Then run the installer. I changed the clock and pressed up to run the install command again and that will not work.

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I still get this error:

2020-02-01 20:20:53.831 createinstallmedia[7457:102835] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Couldn't posix_spawn: error 35'
*** First throw call stack:
(
    0   CoreFoundation                      0x00007fff3c98a8ab __exceptionPreprocess + 250
    1   libobjc.A.dylib                     0x00007fff72c44805 objc_exception_throw + 48
    2   Foundation                          0x00007fff3f056db5 -[NSConcreteTask launchWithDictionary:error:] + 5014
    3   Foundation                          0x00007fff3f0805d5 +[NSTask launchedTaskWithLaunchPath:arguments:] + 153
    4   createinstallmedia                  0x0000000101f30968 createinstallmedia + 6504
    5   libdyld.dylib                       0x00007fff73fb27fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Using a MBP 2017 with Catalina to create a boot installer on a SSD for a late 2009 iMac.

Any ideas on how to install macOS Sierra on the 2009 iMac? No solutions are working..

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Ouch! I don't think there is any way to do that!

You have a system which is using APFS trying to setup a bootable HFS+ volume. To add to it the installer was never intended to run on a APFS volume.

You'll need to find another older system to setup the installer.

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Thanks for the quick answer @danj :) Very strange that this is not possible, but it is solvable. Just have to swap the old HDD back in the iMac and download the installer and prepare the SSD. Am I correct?

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You don't need to open the system again. You should be able to install the drive in a FireWire case and then using the Option key boot up under it to then install the OS from it, all from the 2009 system.

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I already had the LCD in but not screwed in so it was an easy task to flip it out and replace the SSD. (And who has a FireWire case in 2020) ;)

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I'll admit they are getting harder to find ;-}

But, you have a sticky wicket here! If I remember correctly the 2009 Mac's will only boot up via optical drive CD disk or external FW drive other than the internal SATA drive. The 2010 models where the first models which boot up under USB.

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David will be eternally grateful.
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