07-08-2020, 04:00 PM
bmaptool will work with the image still compressed (.img.gz still, not extracted to .img), at least version 3.4 did when I used it. So long as the file names of the image and bmap files match you don't need to specify the bmap file name, and mobian provides them with matching names so you just need to download both and use them. Your command structure is right - the command for my filename and block device was:
sudo bmaptool copy mobian-pinephone-20200615.img.gz /dev/sdc
sudo bmaptool copy mobian-pinephone-20200615.img.gz /dev/sdc