How to make USB bootable disk for Mavericks on older iMac on MacBook M1?

[MitzEclipse]

Hi all
I have a Mavericks.dmg file I want to create a bootable disk. Is it possible to do this on M-series? Any ideas?

 

[Wowfunhappy]

Since Disk Utility doesn't seem to be working for you, have you tried:

sudo asr restore --source InstallMacOSXMavericks.dmg --target /Volumes/"NameOfYourDisk" --erase

Replace 'NameOfYourDisk' with the name of your USB flash drive.

 

[Wowfunhappy]

...although that will fail if the disk doesn't already have a GPT partition map.

Edit:
After more testing, what you need to do via the Terminal is:

asr imagescan --source InstallMacOSXMavericks.dmg
sudo diskutil partitionDisk /dev/diskX GPT jhfs+ temp 100%
sudo asr restore --source InstallMacOSXMavericks.dmg --target /Volumes/temp --erase

Replace X with the number for your USB Drive. You can find it in Disk Utility or via diskutil list. It should go without saying this will destroy all data on the USB drive.