Download the latest tluck Clover files and extract it.Find EFI on EFI, Install macOS High Sierra at the bottom and mount the EFI partition you should see a new EFI drive with an EFI folder inside containing two folders: BOOT and CLOVER.Download and launch Clover Configurator.After about 30 minutes, you will see the message "copy complete" indicating you are ready to continue.Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/USB -applicationpath /Applications/Install\ macOS\ High\ Sierra.app -nointeraction Open Terminal and enter the following command:.Select the USB disk itself (not the volume) on the left pane and erase it using the following settings:.Insert your USB drive and open Disk Utility.Download macOS High Sierra from the App Store file size should be 5.2GB.Fire up your Apple computer of choice for the following steps. Since this is the only step we will need a Macintosh for, we will go ahead and do this first. I went with an inexpensive HP M700 120GB SSD and this ultrabay caddy. A secondary hard drive: you can either get a mSATA or a laptop HDD but if you go with the latter, you will need an ultrabay caddy to hold one of the hard drives.I recommend the Dell DW 1510 AGN Wi-Fi card. A macOS-compatible Wi-Fi card: the one that came with the T420 is not compatible with the OS.Access to a Macintosh and a 8GB or larger USB drive you will need them to download macOS High Sierra (10.13).Speaking of starting, there are a few more things you need before we begin. I took advantage of the free upgrade to Windows 10 and have not found any issues driver-wise so the guide will start from this assumption. Like most Thinkpads, my T420 came out of the box running Windows Windows 7 to be specific. This is a guide for turning a Lenovo Thinkpad T420 into an even more powerful multi-tool running both macOS and Windows 10. While Apple laptops are my gold standard for laptop design and usability, there is a special place in my heart for old-school Thinkpads that are built like tanks and ready to go to work wherever they are, especially with their full array of ports, removable components, and roll cages.
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