i have the exact same issue, bare board v1.3, no output from rv header but mcu works, can’t get a boot to start, and used one of the same RAM as stated supported list
i could guess from others it could be the RAM but since your ram is the official one, i guess that is not the issue… there must be something non-obvious that we are missing…?
EDIT:
from what i gather in this thread, 2Rx4 ram won’t likely work, and someone who had the same issue used a 8GB Samsung 1Rx8 did the trick, so I’m gonna order that one and see what happens…