So you’ve locked yourself out of macOS by making changes to your Clover EFI folder and you don’t have a backup to get back in. Fortunately there is a way to make changes to your EFI partition on Windows in case this happens to you.
UniBeast is a handy Utility that helps you create a Bootable USB pen drive for easy installation of Mountain Lion OS X 10.8 on PC. Here’s what you need: UniBeast / Multibeast. Download it from Tonymac forums and install to /Applications. Access to an operational OS X system. (This can be your friend’s macbook or another hackintoshed system). Doing so will shift your Windows computer's boot priority so that installation USB drive will be selected as the boot point once you plug it in. You may have to press another key to confirm this choice. Aug 07, 2020 Boot macOS off of your drive again. Mount the EFI partition of the boot drive using Clover Configuration. Open the EFI. Navigate to EFI/Boot. Copy the file BOOTX64.efi. Navigate to EFI/Windows/Boot. Past BOOTX64.efi here. Rename BOOTX64.efi to bootmgfw.efi. Restart and boot off the Windows Boot. Plug your USB drive into Mac OS X, and open Disk Utility (located in the Utilities folder in the Applications folder). Select the USB drive in the sidebar of Disk Utility, go to the 'Partition' tab of Disk Utility, and create a new partition layout with 1 partition. Otherwise, Windows won't boot afterwards. Also, after installing Mac OS X. 7.Now plugin both your USB drives on the computer on which you want to install OS X.On the boot prompt SELECT THE 1 GB USB DRIVE.Clover bootloader will be loaded and your OS X installer USB will show up on the boot devices list.DONT CLICK DIRECTLY ON THE INSTALLER.CLICK ON 'BOOT UEFI MENU FROM CLOVER' FIRST AND THEN SELECT YOUR INSTALLER.Also.
Step 1. Mount EFI Partition on Windows
In order to be able to access the macOS EFI partition on Windows we first need to mount it. There are a couple ways to mount an EFI partition, in my opinion the simplest way is to give it a drive letter.
- Install MiniTool Partition Wizard Free Edition
- Open MiniTool Partition Wizard
- Right-Click the EFI partition and click Change Letter
- Select an unused drive letter (I picked Z:)
- Click Apply
- Apply pending Changes? : Yes
- Click OK
The EFI partition will not be mounted as you can see in Windows Exporer, but you wont have permission to access or edit it just yet.
Step 2. Access & Edit EFI partition on Windows
In order to open the EFI partition on Windows and be able to make changes to it’s contents we are going to use a third party program called Explorer++
- Download Explorer++
- Unzip explorer++.zip by right-clicking the zip file and selecting Extract All… and click Extract
- Open the now unzipped explorer++ folder
- Right-Click Explorer++ and select Run as administrator
- You should now see your EFI folder which you can open and make changes too through the Explorer++ program.
Done.
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