Step 2: Create a bootable USB drive. After downloading, extract all the contents of the .xz folder using WinRAR, 7-Zip, etc. Download Rufus online, launch it, and connect a USB flash drive to your Windows 11/10 PC. Run Rufus, choose the ISO file you have got, and clickSTART > OK...
An x86_64 system to perform the build. 64-bit hardware and OS are a must. The Chromium OS is a very large project, building from the source from scratch usually takes hours to over 10 hours, depending on the system configuration.