install packages
apt install gddrescue testdisk rsync kpartx dosfstoolsgddrescue create an image of sdcard
ddrescue /dev/sdX rescueimage.img logfiletestdisk repair broken vfat
testdisk rescueimage.imgkpartx access disk image’s partition
kpartx -a -v rescueimage.imgfsck vfat
fsck.vfat /dev/mapper/loop1p1mount
mount /dev/mapper/loop1p1 /mntHave fun!