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Before OS X starts up, just after you hear the startup sound, repeatedly press and hold down the Option (or Alt key if your using a Windows keyboard) for a second or two until you see the boot selection options.Reboot your Mac with the bootable Windows 10 Installer USB plugged in.Note this action also requires OSX SIP to be disabled, if you get permission errors, make sure you have completed Step 1. Note that gdisk won't confirm a change it'll just show you a new experts' prompt. Type n to create a fresh protective MBR.If not, type q to quit without saving your changes and double check the device number. You should see the BOOTCAMP partition we created in Step 5. Type p to view the partition table to verify you're working on the correct disk.Launch gdisk on your internal hard disk by running sudo gdisk /dev/disk0, if your internal hard disk was not disk0 in the previous step, replace disk0 with what it was here.Open Terminal from Applications -> Utilities.Choose your internal hard drive (not one of the partitions) and note down the Device, it's probably disk0.Open Disk Utility from Applications -> Utilities.Find the device number for the internal hard disk:.You will probably get a warning that it's not a signed application, if you do open OSX System Preferences -> Security and Privacy -> General and you should see a note down the bottom about the application you just tried to open with an offer to open it again. 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.
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This reduces the attack surface for malware that relies on modifying system files by preventing any user, whether with system administrator ("root") privileges or not from modifying a number of operating system directories and files. Step 1: Disable El Capitan's System Integrity ProtectionĮl Capitan ships with a new OS X feature: System Integrity Protection (SIP), also known as "rootless" mode.