eos-write-image is a command-line utility included in Endless OS. It allows advanced users to flash an image they have already downloaded to a target storage device. For example, this command can be used to flash an Endless OS ISO or image file to a USB disk.
Internally eos-write-image wraps around dd however this utility automatically handles compression, ensures that the target device is not mounted, etc.
Download the ISO or image file that you want to flash.
Insert your USB device; for best results, use the fastest USB 3 drive you can find and ensure you’re inserting it into a USB 3 port, e.g. a blue-colored port or one with an “SS” or “SuperSpeed” logo
Identify the device node that corresponds to target storage device. You could do this by examining available storage devices in GNOME Disks or by running fdisk -l. Note that you should use the main device node (e.g. /dev/sdb) and not a partition device node (e.g. /dev/sdb1
Open Terminal
Run the command: sudo <script> <image ISO> <device USB> for example:
sudo eos-write-image eos-eos3.8-amd64-amd64.200609-195252.base.img.xz /dev/sdb
Wait for the process to complete
Next, you’ll boot your computer from your new Endless OS USB drive.