Ok, now I've reached a dead-end.
After the HDMI handshake reset, two days things worked fine. Third day, I wake up, turn on the soundbar and no audio, no video from ANY streaming devices. Just a low hum from the soundbar. Tried the same reset multiple times, switched HDMI cables - nada, essentially the soundbar is a piece of brick at this point.
Currently, I've reset the soundbar, removed ALL HDMI connections - but as soon as I connect the power cord, slow hum starts. Whether or not the soundbar is in standby or turned on - the same hum. I am worried the bar is bricked?
Wrote to Nakamichi, hopefully, they will respond.
Update 1: I also tried downgrading to 2.1 - same issue, constant hum, no audio, no video. At this point, I am so damn frustrated, want to send the brick back to Walmart.
Update 2: Ray responded and asked for serial number and receipt. Wonder what's coming next. Hopefully, don't have to go through shipping it back nightmare
Update 3: The soundbar indeed seems bricked. Ray asked for 24-hours time while he looks at arranging a replacement.
Has anyone gone through the replacement? How does it work? Unfortunately I have not saved the original packaging. I waited till last week - decided its been two months, safe to get rid of the huge box and dang...62 days later - soundbar bricked.