Hi, i am beginner in SBC other than Rapsberry Pi and i just got my NanoPi R1 with case.   I try power the board without SD card for the first time and i see that friendlyWRT already installed but i would like to use a general OS. Since i can't download the official OS from friendlyelec, i saw that armbian is another way and might be better.   I follow all step in quick start guide page, and can't even get my board boot up. Below is the list of OS that i try with SD card: