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See the guide here to dual-boot macOS and Windows.Please use our contact form if you find anything that isn’t accurate.

Install the latest version of the official T430s BIOS available from Lenovo here.Optional: Use the 1vyrain process to flash a modified BIOS to remove the WiFi whitelist and enable additional advanced settings.Press F1 at startup to adjust the BIOS settings as follows.– Startup > UEFI/Legacy Boot > UEFI Only – CSM Support > No – Config > Serial ATA (SATA) > SATA Controller Mode Option > AHCI – Config > Display > Graphics Device > Integrated Graphics (only necessary on units with NVIDIA Optimus) – Restart > Load Setup Defaults – OS Optimized Defaults > Disabled.Download the Install macOS Catalina app from the App Store.Open A pplications > Utilities > Disk Utility. Click the Mount Partition button to the right of the EFI partition of your USB.Launch Clover Configurator from the Utility and Kext Pack and click Mount EFI.Download the ThinkPad T430s macOS 10.15 Utility and Kext Pack and place a copy on your installation USB.After approximately 25-35 minutes the process will finish and the USB will be renamed Install macOS Catalina (wait for the “copy complete” message in the Terminal before continuing).Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/USB -nointeraction Open Applications > Utilities > Terminal and enter the following command.– Under Scheme select GUID Partition Map (If the Scheme option is not visible, go to the View menu and select Show All Devices) – Under Format: select Mac OS Extended (Journaled) – Select the USB disk in the left pane (select the physical disk, not a volume on the disk)