Yes, when I boot from SD every thing is OK! It is weird, because after installing to nand installation logs message was successfully complete but booting from nand has no ip! green led blinking fast and red led blinking slow.
I involve with a problem that you had with S9j control board.
I install Braiin Os on board by SD card and then try to write on board by NANAD command in software. Everything goes right and messages are successful . But procedure doesn't work . I couldn't get IP ! my problem is exactly like yours.
I found out you had this problem with 3 S9j a couple months ago . Finally could you find a way to solve this problem?If yes , let me know how.?