Before I dive into suggestions, I need to emphasize that Chrome OS Flex is an official operating system from Google, and modifying or cracking it might not be the best approach. That being said, here are a few features and tips that might interest you:

: The safest and most verified source for Chrome OS Flex is Google's official website. Google provides direct download links for the installation tool.

Insert the USB into your old device and enter the boot menu (usually by tapping F12, F9, or Esc during startup). Try or Install:

If you're interested in installing Chrome OS Flex on your device, here are the general steps: