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I have a problem with making bootable USB.

I'm getting this error:

Macintosh:~ **$ sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ macOS\ High\ Sierra.app
Ready to start.
To continue we need to erase the volume at /Volumes/Untitled.
If you wish to continue type (Y) then press return: y
APFS disks may not be used as bootable install media.

On the same usb drive I had Yosemite, but for some reason I can't make it work with High Sierra. Also tried to erase it in Disk Utility(no errors).

Can somebody help?

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    When erasing the USB drive, change the Format to Mac OS Extended and try creating the installer again. – Nimesh Neema May 2 '18 at 21:05
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    @NimeshNeema that's the problem, I did(using disk utility) without errors, then I went back to the terminal and tried to create bootable usb again, but got the same error. Will try to restart macbook. – kironet May 2 '18 at 21:29
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    What format does Disk Utility say the volume is in? – Gordon Davisson May 2 '18 at 22:06
  • @GordonDavisson I restarted Mac and everything works now. Thanks – kironet May 3 '18 at 9:44
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I think the message is quite straightforward: It seems like your USB stick is formatted as APFS and the error message says that you can't.

Reformat the USB Stick using Mac OS Extended instead.

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I also faced similar issue. When I verified the disk name I found that my internal disk name was also 'Untitled' as shown in below image.

So I changed USB device name and it worked.

enter image description here

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I had the same issue, but solve it using Paragon free software to downgrade to HFS+, as the Disk Utility didn't have to option to erase it to that format.

https://www.paragon-software.com/home/apfs-hfs-converter/

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