you should use ddto write the disk image on your second sd card.

It's not obvious that there is an equivalence between a dns name and an IP adress.For exemple you can have an alias dns-name which can change of IP depending of the avaibility of the server behind. You can also have dns round robin which will permute the ip address from a set of IP associated to a uniq dns entry.

Red color means the target of the link doesn't exist. So /root/sendsms_module/app/addons/sendsms does not exist.

Does this answer your question? grub error: you need to load kernel first