I've deleted and re-downloaded the Monterey installer from Apple and tried to create the ISO with the GUI again. The GUI frontend produces the same error message. That was the one I was referring to in the first post - at least that's the GUI for the script I was using. MultiOS wrote:For example, you could try creating the ISO using a purpose built 'freeware' utility such as Sep 2019, 16:51 Location: United Kingdom Primary OS: Mac OS X other VBox Version: PUEL Guest OSses: WIN11,10, 7, Linux (various) Otherwise, we need someone to come along with more direct knowledge of successfully creating Monterey/Big Sur macOS ISOs and VMs, as I've never seen this EFI issue when creating Windows 10/11 or Linux VMs. For example, you could try creating the ISO using a purpose built 'freeware' utility such as or both of which seem to have been tested against recent versions of macOS. With regard to the EFI installation problem, the only further testing option I can personally think of is to try creating an ISO installer by a different method to see if the same problem is still encountered. You have allocated significantly more RAM to the VM than is actually available, so you need to either limit the RAM usage by both the Host and Guest systems to a remain below 8GB, or consider upgrading the RAM to at least 16GB. For the pre-configured optical drive, I selected the ISO created above. 4 MB RAM, 50 GB HDD, removed the floppy drive from boot, changed vCPUs to 2 and video memory to 128 MB as well as USB to USB 3.0. Now: Using Virtualbox 6.1.36 with the corresponding extension pack, I've created a new machine using the Mac OS X 64-bit template. $ mv MontereyInstall.cdr MontereyInstall.isoįine so far. $ hdiutil convert MontereyInstall.dmg -format UDTO -o MontereyInstall.cdr This worked, so I was able to proceed withĬode: Select all Expand view Collapse view $ hdiutil detach /Volumes/Install\ macOS\ Monterey/ But that appears to be a known problem, so I recreated the image file using the Festplattendienstprogramm GUI and repeated the last command. If you wish to continue type (Y) then press return: y To continue we need to erase the volume at /Volumes/MontereyInstall. $ sudo /Applications/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia -volume /Volumes/MontereyInstall/ MontereyInstall.dmg -noverify -mountpoint /Volumes/MontereyInstall MontereyInstall -size 16384m -volname MontereyInstall -layout SPUD -fs HFS J > /Applications/Install macOS Monterey.app/Contents/SharedSupport/InstallESD.dmg file not found!Ĭode: Select all Expand view Collapse view $ hdiutil create -o. > /Applications/Install macOS Monterey.app *** ERROR: The provided application is NOT a valid OSX InstallerApp: With help from granada29 VirtualBox forums. Īpple OSX Installer Application to ISO creation toolĬopyright (C) 2017-2019, socratis VirtualBox forums, InstallerApp2ISO.sh -i /Applications/Install\ macOS\ Monterey.app -o. So far, all I've been able to produce is a frustrating collection of error messages.įirst, I tried to use the script from the pinned post I can not link to because I just registered to create a bootable ISO image:Ĭode: Select all Expand view Collapse view $ sudo. Now I need to create a macOS guest in order to try something on a clean system. I've been using VirtualBox for several years now, mostly running Linux and Windows guests. I have a genuine Mac mini (2018) running macOS 10.15.7 (Catalina) as the host system.
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