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Write Orange Pi Image to microSD Card.

# download latest armbian image archive
wget https://dl.armbian.com/orangepizero/Debian_stretch_next.7z -O image.7z
# extract image from archive
7z e image.7z
# put image on SD card
sudo dd if=Armbian_5.38_Orangepizero_Debian_stretch_next_4.14.14.img of=/dev/mmcblk0 status=progress
# flush block device buffer to ensure that SD card is written
sync

Plug the SD card into the Orange Pi, connect it to the network vie ethernet and power it up. Search for Orange Pi in network.

nmap 10.42.23.0/24 -p 22 | grep open -B 4 | grep -Po '\d+\.\d+\.\d+\.\d+' | tee /tmp/wo
### power the Orange Pi on and wait a minute
sleep 60s
nmap 10.42.23.0/24 -p 22 | grep open -B 4 | grep -Po '\d+\.\d+\.\d+\.\d+' | tee /tmp/w
diff /tmp/w /tmp/wo

SSH onto machine with username root and password 1234 Play through the dialog and create a new user with username user and password user. All other options are irrelevant.

# maximize partition size
echo ", +" | sfdisk -N 1 /dev/mmcblk0 --force
partprobe
resize2fs /dev/mmcblk0p1
sync
# set root password to root
usermod root --password root
# add user to sudo group
usermod user --append --groups sudo
su user
apt update
apt upgrade