This was unsuccessful and rather difficult to achieve because this key is not made for being modified.Īt last, I recreated a key using the 'standard' step by step installation, which is almost successful.

Indeed I made many different tries, beginning with patching a USB installation key made by the 'createInstallMedia' command line. I modified System/Installation/Packages/ist, System/Installation/Packages/OSInstall.mpkg, and System/Library/CoreServices/ist (for both board-id and model). Using that, my MacPro perfectly runs under Mavericks, but I cannot reinstall it without using an external mac, or cloning my previously-saved installation from an external drive. Seems for me that there is no other way for installing Mavericks on my MacPro 1,1 than using the target mode from a supported Mac, and patching the boot.efi files after the installation. This is not the same thing than when running from a non-modified installation key, which fails almost immediately when checking the machine, no ! The patched installation really starts, using the modified informations (InstallableMachines and so on), but fails on the online authentification.

No matter what I do for creation of an USB installation key for Mavericks on a Mac Pro 1,1, It seems that an online authentification towards Apple servers takes place at the beginning of the installation process, refusing to proceed the installation furthermore. Apple online authentification prevents Mavericks installation

Hacked mac os x mavericks dmg