Oddly, I had the same issue with a 7” in-wall T3 today as well. Perhaps a OTA update, but not sure. For me it was the oldest of my 3 touchscreens. I was however able to resurrect it by performing a factory reset (pressing the pinhole reset button then followed by pressing and holding the pinhole button by the microphone at the top of the screen). It’ll flash a warning then say “erasing.” Mine then went to the setup screen like when they were brand new, but then provisioned itself, only had to setup screensaver etc. again. All other resets failed, button, POE etc., it would just sit on the splash screen where the C4 logo flips around. You might give the same a shot with yours, it worked for me.