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Thanks to Clover EFI Bootloader I was able to achieve almost perfect HacBook Pro from my Lenovo T420 This guide is work in progress and I’ll try to update it as often as I can outdated! For more updated guide head to tluck's post #481 (thanks tluck for taking over) Why UEFI Only? Faster boot time, better hardware detection, native Mac OS X Installation process and Auto create Recovery HD, working iCloud and iMessage to name a few. But in general you will achieve almost perfect Macbook Pro clone that will most likely survive all future System updates. Note: I’ll be focusing on Mountain Lion but I guess Lion would work equally good. Lets start by preparing Mac OS X install media. You will need: - Working Mac OS X 10.6 or later (Hackintosh, Virtual machine or real Mac) - 8GB+ USB pen-drive - Legal copy of Mountain Lion install app - and an app called Lion Disk Maker - my custom Clover Package: Clover_v2_r1625k0.pkg.zip Prepare Mountain Lion install media using Lion DiskMaker. Making install media bootable on your ThinkPad Run my custom Clover Package and change the install destination to the Mountain Lion install media you’ve just created using Lion DiskMaker. Generaly you don't have to worry about anything else it is all customized to work best on all ThinkPads. Note (optional): At this point you can use another FAT32 formatted pen-drive to install Clover on to it. This pen-drive needs to be capable of storing at least 25MB+ of data. System installation Insert prepared OS X Mountain Lion Install Disk - 10.8 in your ThinkPad and set to boot in UEFI Only mode. And wait for the boot loader. You should be presented with screen like this: Now start the installation process just like you would on a normal Mac. Partition your drive with GUID table and install. Adding Extra drivers using myHack You now should be running vanilla Mac OS X 10.8. Before you start upgrading and instaling software now is a good time to add missing drivers and install them in a clean and proper manner using myHack. 1. Download Extra Folder: Extra.zip 2. Download myHack and place it in your Application folder 3. Run myHack and choose myFix. When asked about Extra folder choose "Use My Own" and point to downloaded Extra folder from step 1. Reboot and check if everything is working fine. By everything, beside AppleACPIPlatform.kext ver 1.3.5, I mean Sound and Battery meter cause these are the only kexts that are in Extra/Extentions Making your custom configuration using OEM folder ... under construction... Booting Clover EFI Bootloader from system drive It's time to get rid of the osx pen-drive you've been booting all the time and install my custom Clover to your main disk and boot directly from your hard drive EFI partition. This step is identical to the "Making install media bootable on your ThinkPad" but this time you will be using your main drive. Just make sure your disk drive is selected when installing. Note: Now You can customize your installation. You have the choice to install Clover Preference Panel and Optional RC scripts. Remove pen-drive and reboot. If all went well you should be booting from your hard drives EFI partition now. Good luck! Software worth mentioning Clover EFI bootloader (thread) - (source code) - (changelog) - (wiki) CloverGrower (post) - (source code) HWMonitor + HWSensors (thread) - (source code) DSDT Editor (thread) DarwinDumper (thread) ... Thanks and credits @Slice, @dmazar and all Clover thread members, @joshhh and all T510 thread members, @gothic860 and all W520 thread members, @Manwe150 and all T420 thread members .…. to be continued. Update 2013-01-20: Flashed latest UEFI Bios version 1.43 + whitelist and started fresh DSDT patching Update 2013-01-30: Uploaded new LenovoEFI_Pack_Beta2.zip (from now on I'll be attaching latest version to this thread). I've started using the EFI/OEM/4180A32 folder specific for my T420 model and added minimal config in the root that should work for everyone else (testers needed). My latest DSDT.aml in EFI/OEM/4180A32/ACPI/patched and updated ThinkPad theme is included. Update 2013-05-15: Updated the post to reflect some changes and progress made in this topic. Using custom Clover r1625 that has all the stuff Lenovo UEFI user needs. This one is enabled to install to ESP by default with ThinkPad Theme and RC scripts and example EFI/CLOVER/OEM/4180A32 folder.