update.img cannot boot my board

nipsedis

Hi, recently I bought AIO-3399ProJD4 and as per this document (https://wiki.t-firefly.com/en/AI ... ux_compile_gpt.html) I made an image file for Ubuntu OS.
On my linux host pc, flashing image to the board failed for the reason that I couldn't find out.
So I tried flashing the board with Windows10 host PC and it was succeeded.
But when I tried to boot the board, the connected HDMI monitor showed nothing.
I cannot sure I made my image file properly.
It is very apreciated if someone provide ready-to-flash image file for my AIO-3399ProJD4 board. I'm struggling with this board for 1 week already...
Thank you, thank you.