Hi, try changing the BIOS setting as folows: 1. cheeck that your SATA setings ar on "AHCI". 2. UEFI Boot Path Security set to "Never". 3. Secure Boot Enable set to “Disabled” worked for me on a dell computer. source: https://jasoncoltrin.com/2018/02/09/how-to-clone-a-dell-optiplex-7050-m-2-nvme-hard-drive-with-clonezilla-and-an-external-usb-hdd/