Also getting a black screen that started yesterday on my Ownice. Though it started after I was fiddling with casting to the screen. Wonder if it's the same issue though I don't recall updating my Tesla (in fact yesterday on way to airport I was getting an "update available" notification - and as a result couldn't try and reset the Ownice since there was no wifi icon on the tesla that ever showed up, just the red down arrow indicating it was waiting for wifi to download the Tesla updated software).
How do you update the Ownice to new firmware if you are getting a black screen?