How to secure WD My Passport Pro with SSH key

firstly enable ssh access from WD My Cloud GUI and setup your own secure password
login to ssh with your password
modify permissions on /home/root dir - it is too wide open - chmod 755 /home/root
generate new public/private keys ssh-keygen -t ed25519 or use your old keys
create authorized_keys file mkdir -p /home/root/.ssh/ && touch /home/root/.ssh/authorized_keys
add your public key to this file cat /home/root/.ssh/id_ed25519.pub >> /home/root/.ssh/authorized_keys
copy private key from /home/root/.ssh/id_ed25519 to your computer and test connection ssh -v -i id_ed25519 root@192.168.60.1
if it works, you should disable PasswordAuthentication no in /etc/ssh/sshd_config - remove "#" infront of "PasswordAuthentication yes" and change "yes" to "no". Command vi /etc/ssh/sshd_config, press insert, make changes, press ESC, press :w!, press enter - it will write, press :q, press enter - will close vim.
now type reboot and wait for device reboot

If you did some mistake and you won`t be able to login via SSH, just go to WD support page, download latest firmware and reflash it via browser UI.