Update 2017.09.25: Now that 10.13 is out this guide is obsolete. High Sierra update guide. Installing the 10.13 beta (starting the installer app from a booted 10.12 installation) to a new partition. Testing APFS filesystem and 10.13 Clover configuration. These steps are to verify a working config before upgrading to High Sierra when it is released. It is not recommended to use beta software on your main machine. If you do want use beta software, do not risk your data, see the guide for creating installation media and install where it doesn't matter if things break. 1. Update Backup your EFI folder. Update to the latest Clover, update FakeSMC in /efi/clover/kexts/other and update other essential kexts. Clover installer packages FakeSMC 2. APFS EFI Driver We need to install Apple's APFS.EFI driver to a folder in our Clover installation, before we can boot from an APFS volume. Locate the 'Install macOS High Sierra Beta' bundle in your Applications folder Show Package Contents -> Contents -> SharedSupport -> BaseSystem.dmg BaseSystem.dmg -> usr -> standalone -> i386 -> apfs.efi Copy the APFS.EFI driver to the correct location for your installation type: For Clover UEFI Install APFS.EFI to /efi/clover/drivers64uefi For Clover LEGACY or CSM or BIOS Install APFS.EFI to /efi/clover/drivers64 3. Test updated configuration Reboot 10.12 and run $ bdmesg Code (Text): ... 0:112 0:000 === [ LoadDrivers ] ======================================= 0:116 0:003 Loading FSInject-64.efi status=Success 0:118 0:001 Loading OsxFatBinaryDrv-64.efi status=Success 0:118 0:000 Loading OsxAptioFix2Drv-64.efi status=Success 0:119 0:000 Loading HFSPlus.efi status=Success 0:120 0:001 - driver needs connecting 0:120 0:000 Loading AppleKeyAggregator-64.efi status=Success 0:121 0:000 Loading AppleImageCodec-64.efi status=Success 0:121 0:000 Loading AppleUITheme-64.efi status=Success 0:122 0:000 Loading FirmwareVolume-64.efi status=Success 0:123 0:000 Loading SMCHelper-64.efi status=Success 0:123 0:000 Loading APFS.EFI status=Success 0:131 0:007 - driver needs connecting 0:131 0:000 2 drivers needs connecting ... 0:131 0:000 PlatformDriverOverrideProtocol not found. Installing ... Success 0:131 0:000 HFS+ driver loaded 0:131 0:000 APFS driver loaded 0:131 0:000 Searching for invalid DiskIo BY_DRIVER connects: not found, all ok ... We can see that the APFS driver is loading. 4. Prepare Partition Create a new HFS+ partition on your boot SSD (or any disk) e.g. 'HighSierraBeta' with disk utility. 5. Begin Installation Open the beta installer app. Select the newly created partition as the installation target Show All Disks -> e.g. 'HighSierraBeta' 6. Complete Installation After a short time, restart to the boot loader and install the beta. $ diskutil list Code (Text): /dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *480.1 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 239.4 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Microsoft Reserved 16.8 MB disk0s4 5: Microsoft Basic Data Windows 62.4 GB disk0s5 6: Windows Recovery 471.9 MB disk0s6 7: Linux Filesystem 41.9 GB disk0s7 8: Apple_APFS Container disk1 82.8 GB disk0s8 9: Apple_KernelCoreDump 655.4 MB disk0s9 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +82.8 GB disk1 Physical Store disk0s8 1: APFS Volume HighSierraBeta 8.3 GB disk1s1 2: APFS Volume Preboot 19.6 MB disk1s2 3: APFS Volume Recovery 505.4 MB disk1s3 4: APFS Volume VM 2.1 GB disk1s4 $ uname -v Code (Text): Darwin Kernel Version 17.0.0: Tue Jun 13 21:06:15 PDT 2017; root:xnu-44220.127.116.11.1~1/RELEASE_X86_64 Notes Thanks to the Clover developers, the state of the bootloader means that with APFS.EFI installed, 10.13 should "just work" (with compatible hardware and user configuration of course). There is a new CSR flag in 10.13 "Allow Device Configuration", see Clover options -> System Parameters -> System Integrity Protection, and update CsrActiveConfig in your config.plist if necessary. The option to keep an HFS+ file system on SSDs has been removed from the installer. If you arrive at a kernel panic with com.apple.driver.AppleACPIPlatform you can try dropping the MATS table. This method is for starting the beta installer from a working 10.12 installation using your existing EFI partition. For creating an installation USB see here.