Correct. Do the bootloader first . Repeat process for the image.
https://www.digitalworldz.co.uk/dreambox-dm800hd-support-452/208583-dreambox-dm800hd-my-guide.html
https://www.digitalworldz.co.uk/dreambox-dm800hd-support-452/208583-dreambox-dm800hd-my-guide.html