I háve the Ulta model and like others it’s stopped working and now all I can get is the bouncing logo on a black screen. I’ve done all the resets but nothing is working.
Did you try a factory reset? Hold the reset button down a good 30 seconds while powered it matters.
Is it a Roku 2020 or 2019?
Remove any MicroSD memory.
Roku Ultra's are built well inside.