ROCK 5B+ seems promising

#1

radxa ROCK 5B+ seems promising but:

  1. does it support 5G sim connectivity?
  2. can we install openWRT on it?
  3. it has built in HDMI in and out, I wonder if it is possible to process incoming hdmi video stream and output in another hdmi port? (e.g. add logo in video stream)
  4. supports wireless display?
    planning to connect to waveshare display wirelessly https://www.waveshare.com/7inch-hdmi-lcd-c.htm

any pointers will be good for me

#2
  1. Not currently and the m.2 B-key is only USB 2.0
  2. Not currently
  3. Possibly but it won’t likely work the way want
  4. What do you mean wireless?