Flash SD Card

To write the microSD card image, install bmap-tools on the Linux PC with the following command.

sudo apt install bmap-tools

Check the sd card device.

lsblk

if the sd card device is /dev/sdx, and sd card is mounted, unmount the sd card.

sudo umount /dev/sdx1
sudo umount /dev/sdx2

Wire the SD card to the host PC.

sudo bmaptool copy core-image-<target>-<borad>.wic.gz /dev/sdx

if you want to resize the sd card partition, follow the steps below.

Check the sd card partition.

sudo fdisk -l /dev/sdx

Select the ext4 partition to resize.

sudo growpart /dev/sdx 2

Resize the filesystem.

sudo resize2fs /dev/sdx2