Video confusing-please provide step documentation #1
Thanks for providing.. but that video is confusing without documentation..
In the video you show your on a raspberry pi already.. confusing.
Assuming you have two SD card, one with Raspbian installed and used to boot up with the raspberry pi 3, then you can use this linux system to flash the Android image to another SD card.
The video just tech you how to flash the image to SD card in linux environment.