Foreign nationals of Ethiopian Origin can get a 5 Years Yellow Card.
How to obtain Foreign National of Ethiopian Origin ID Card called Yellow Card. You will need evidence that you are of Ethiopian Origin.
I have sent links from different Ethiopian Embassies abroad and documents & other information.
https://www.ethiopiatourisms.com/the-ye … n-id-card/
https://ethiopianembassy.org/ethiopian-origin-id/
https://www.ethioembassy.org.uk/consula … rd/#step-2
This law talks about Yellow Card holder rights. It is a very good read.
https://www.lawethiopia.com/index.php?o … temid=1026
All this information was online. I hope it helps you.
Just read all the information and read the requirements section. Remember Ethiopia has 11 Regions 2 Federal cities. You need to get documents from your parents/ grandparents originally region or federal cities.
More evidence you have more cases will go well.
Each of the 11 Region & federal cities has a Diaspora office they will be very helpful too.
I wish you all the best.
Keep us updated on progress of case.
My family got Yellow Cards 
Regards
LH