Here is a pastebin of my config, adapted from Lu Xu's dotfiles [0]

https://pastebin.com/RgbgLUTq

[0] https://github.com/xlucn/dotfiles

It is Lu Xu's dotfiles you should focus on if you want to understand how fb* tools work.

I invoke fbterm via this script to set the bg image:

  #!/bin/sh
  # fbterm-bi: a wrapper script to enable background image with fbterm
  # usage: fbterm-bi /path/to/image fbterm-options
  
  printf '\033[?25l' # hide cursor
  fbv -ciuker "$1" << EOF
  q
  EOF
  shift
  export FBTERM_BACKGROUND_IMAGE=1
  exec /bin/fbterm "$@"

Oh nice, I will give it a try. Thank you so much!