I have a 4640X that appears to be bricked.
I turned on my TV at my parents tonight to find the Roku on a "Recovery Mode" set of screens I have never seen before. I went through selecting language, the wifi, wifi password and then selected "update" as I assumed it was a bad update file... Ever since then, it is in an endless boot loop. It will do the stupid boot screen for about a minute then go to back and just repeat ad naseum.
I tried plugging power directly into wall...
Different HDMI
There is no SD card to remove
Unplugged the external USB....
Still nothing
Tried holding the reset at the bottom until it recycles... Still nothing... Endless loop on the boot screen and can't think of what ever else to try.
Not happy with an expensive brick