Hello Sylvia,
You misunderstand. The unit doesn't even boot, i.e., doesn't even start the bootloader. In simpler terms, the unit doesn't let any OS start.
I've verified that the unit doesn't hand over control to any bootloader.
Your link talks about "remote access" after a Windows boot, through userspace VNC softwares. My issue has nothing to do with Windows. In fact, the issue doesn't lie with any OS here. The board simply won't load a bootloader!