Had terrible problems trying to get Devuan on my bpi with a kernel that has wireguard in it (v5.6+), so I took an Armbian install and frankensnorked it using some if the concepts here in dev1fanboy's stuff.

• Write the Armbian image to SD and boot it
• Change /etc/apt/sources.list to

deb http://mishka.snork.ca/devuan/merged chimaera          main
deb http://mishka.snork.ca/devuan/merged chimaera-updates  main
deb http://mishka.snork.ca/devuan/merged chimaera-security main

# apt-get update --allow-insecure-repositories
# apt-get install devuan-keyring --allow-unauthenticated
# apt-get update
# apt-get upgrade
# apt-get install eudev sysvinit-core
# apt-get -f install
# reboot
# apt-get dist-upgrade
# reboot

• Add the following to /etc/network/interfaces

auto eth0
iface eth0 inet dhcp

# apt-get purge systemd libnss-systemd
# apt-get autoremove --purge
# apt-get purge armbian-bsp-cli-bananapi armbian-config armbian-firmware armbian-zsh html2text network-manager-openvpn network-manager screen toilet toilet-fonts zsh zsh-common
# apt-get autoclean