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# Create a blank disk image hdiutil create -o /tmp/SierraFrench -size 8000m -volname SierraFrench -layout SPUD -fs HFS+J hdiutil attach /tmp/SierraFrench.dmg -noverify -mountpoint /Volumes/SierraFrench Copy the installer resources sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraFrench --nointeraction Unmount and convert to ISO hdiutil detach /Volumes/Install\ macOS\ Sierra hdiutil convert /tmp/SierraFrench.dmg -format UDTO -o ~/Desktop/macos-sierra-10.12.6-french.iso mv ~/Desktop/macos-sierra-10.12.6-french.iso.cdr ~/Desktop/macos-sierra-10.12.6-french.iso
VBoxManage modifyvm "SierraFrench" --cpuidset 00000001 000306a9 00020800 80000201 178bfbff VBoxManage setextradata "SierraFrench" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "MacBookPro11,3" VBoxManage setextradata "SierraFrench" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0" Installation proceeds identically to bare metal. The ISO will boot the EFI environment in French. Many French users still own MacBook 5,2 (2008) or Mac mini 3,1 (2009). Sierra 10.12.6 is the last OS for these models.
Alternatively, you can download the combined multilingual version and later strip it to French. Once you have Install macOS Sierra.app (French version), convert it to a bootable ISO with these Terminal commands:
# Create a blank disk image hdiutil create -o /tmp/SierraFrench -size 8000m -volname SierraFrench -layout SPUD -fs HFS+J hdiutil attach /tmp/SierraFrench.dmg -noverify -mountpoint /Volumes/SierraFrench Copy the installer resources sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraFrench --nointeraction Unmount and convert to ISO hdiutil detach /Volumes/Install\ macOS\ Sierra hdiutil convert /tmp/SierraFrench.dmg -format UDTO -o ~/Desktop/macos-sierra-10.12.6-french.iso mv ~/Desktop/macos-sierra-10.12.6-french.iso.cdr ~/Desktop/macos-sierra-10.12.6-french.iso
VBoxManage modifyvm "SierraFrench" --cpuidset 00000001 000306a9 00020800 80000201 178bfbff VBoxManage setextradata "SierraFrench" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "MacBookPro11,3" VBoxManage setextradata "SierraFrench" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0" Installation proceeds identically to bare metal. The ISO will boot the EFI environment in French. Many French users still own MacBook 5,2 (2008) or Mac mini 3,1 (2009). Sierra 10.12.6 is the last OS for these models. macos-sierra-10.12.6-french.iso
Alternatively, you can download the combined multilingual version and later strip it to French. Once you have Install macOS Sierra.app (French version), convert it to a bootable ISO with these Terminal commands: # Create a blank disk image hdiutil create