A variety of Endless OS installation and deployment procedures require you to flash an image, which refers to the process of taking an Endless OS image that you have downloaded and writing it to a storage device. Amongst other cases, image flashing is needed for:
GNOME Disks can be used to flash Endless OS images. This application is available on Endless OS and all major Linux distributions. The instructions below detail the procedure for flashing an Endless OS ISO to USB, but you should adapt these instructions according to your installation context (e.g. you may be using a SD card instead of USB, you may be using a different type of image file).
Insert your the USB stick
Launch GNOME Disks from the application menu or type
gnome-disks as a command in a terminal
Click and select the USB drive from the sidebar on the left
Click on the top-right menu icon( ☰ or ⋮ ) to open the dropdown menu then select Restore Disk Image...
Click in "None" and select the Endless OS ISO image file.
Click "Start Restoring"
Note that all files on your USB stick will be erased. Enter your password and click on "Authenticate".
The flashing process will start automatically.