First. I'm sorry for the English.I have a problem that  I can not get through.I am trying to install ROS using netinstall and putty with RS232 and ethernet interface.The upload is successful. But when I reboot, the situation is still going on.Each time the green led flashes in the video.
I have two problems in my mind
1.Nand Flash is Bad
2.RouterOS License Not Available
https://www.youtube.com/watch?v=HYXoQYgzv6o