Download GPT fdisk from its Sourceforge page and install it.The selected disk is not of the GPT partition style Windows cannot be installed to this disk. If this step is not completed you will get this error when installing Windows 10: Windows 10 requires a GPT disk when using EFI boot, so we need to revert this change using a tool called GPT fdisk (gdisk). This time it will work.ĭuring step 5, OSX tried to be helpful by converting our legal GPT disk partition into a hybrid MBR partition, which makes OSX see the disk as GPT and Windows it as MBR. (You don't need to install the whole X-Code, if it asks.) Once its been installed (it's automatic), you need to go BACK to Terminal and run that command again. Then it will say you need to download a developer tool from Apple. It will probably ask for your password.sudo codesign -fs - /Applications/Utilities/Boot\ Camp\ Assistant.app.Open Terminal (use spotlight to find it) and type this: Boot Camp Assitant will not run if it's been edited. Close and save the file by pressing Ctrl+x followed by y on your keyboard.Remove your model from Win7OnlyModels (if it's there).Delete the word "Pre" from USBBootSupportedModels and add your Model Identifier.Delete the word "Pre" from UEFIModels and add your Model Identifier.Add your Boot ROM Version to DARequiredROMVersions.Open the ist in your favorite text editor, to keep this guide simple, I'll use nano.If you get the error saying cp: : Operation not permitted, SIP is still enabled, please refer to step 1.You will need to enter your OSX user account password.Make a backup of this file by running: sudo cp ist.The file we are going to edit is the ist file.Change directory: cd /Applications/Utilities/Boot Camp Assistant.app/Contents.Open terminal and navigate to /Applications/Utilities/Boot Camp Assistant.app/Contents.My mid-2011's Model Identifier was "iMac12,2" and the Boot ROM Version was "23".Open Terminal and run system_profiler SPHardwareDataType.Find out your Macs Model Identifier and Boot ROM Version:.If you're like me, you haven't touched an optical disk in a few years and prefer the ease and speed of using a USB flash drive instead. Step 2: Modify Bootcamp to allow creation of a bootable USBįor some reason Apple decided that if your Mac has an optical drive, there could be no reason you need to Bootcamp off a USB. Once you have finished installing Windows you should enable SIP again by following the same steps but run csrutil enable instead.
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