If you have more than one macOS installed, add multiple menu entries like this (you can change the name): set timeout=10 If you are using High Sierra with APFS change it to: set timeout=10 Search -set=root -file /System/Library/CoreServices/boot.efiĬhainloader /System/Library/CoreServices/boot.efi On your thumb drive, open the file at boot/grub/grub.cfg with any text editor and change it to: set timeout=10 Then run the following commands to mount and open the iso disk (in my case /dev/disk2) mkdir /tmp/ubuntuįormat your thumb drive as FAT32 and name it RESCUE, then copy the EFI and boot folders from the iso to your thumb drive. Which should return something like: /dev/disk2 Apple_partition_scheme On macOS, assuming you have the iso in the Downloads folder, run the following command on the terminal: hdiutil attach -nomount ~/Downloads/ On Windows (7 and later) or Ubuntu should be straight forward (you just need to double click the iso). In this step we will create a rescue thumb drive that you can use every time you are having trouble booting macOS. Create a rescue thumb drive (Can be done in any OS)
Change the gpu-power-prefs and disable SIPīoot into recovery single user mode (press and hold Command + S + R) and run the following commands: nvram fa4ce28d-b62f-4c99-9cc3-6815686e30f9:gpu-power-prefs=%01%00%00%00ģ.
Known Issues: On High Sierra there are problems related to the screen brightness and sleep issues.
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