check images list
curl -s https://dl.khadas.com/.mega | sh -s - --list
download and write one image
curl -s https://dl.khadas.com/.mega | sh -s - VIM3 VIM3x.EmuElec.ng.3.2.pre.emmc.kresq > /dev/mmcblk0
download and write all images
curl -s https://dl.khadas.com/.mega | sh -s - VIM3 --all > /dev/mmcblk0