Google and Back Market have introduced a new way to breathe life into old PCs and Macs with the launch of preloaded ChromeOS Flex USB keys for just $3. The keys simplify getting ChromeOS up and running on older hardware, but their initial stock is already out of availability. To get started, you can check Google’s list of supported PC and Mac models or create your own custom USB installer using step-by-step instructions provided by the company.
Source: https://www.androidauthority.com/chromeos-flex-usb-keys-available-3654821