# - ==========
# - How to rename network interface back to eth* (instead of i.e. enp0sXX)
# - ==========

Solutions:
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1.) Add 'net.ifnames=0' to parameter 'GRUB_CMDLINE_LINUX' at /etc/default/grub

      GRUB_CMDLINE_LINUX="aufs=tmpfs console=tty0 console=ttyS0,38400n8 reboot=bios net.ifnames=0"


2.) (not tested!) Create a file /etc/systemd/network/10-eth.link with the contents

      [Match]
      MACAddress=ff:ff:ff:ff:ff:ff
      [Link]
      Name=eth0

replacing ff:ff:ff:ff:ff:ff with the MAC address of the device you wanted to change.
After reboot the name was as desired.