I am having strange issues with the Screencast function. I received my Boox Ultra C tablet last week and just tried the function out yesterday. It worked for approximately 5 minutes, then disconnected. I have tried casting to multiple smart TVs since then (with and without a Chromecast dongle) and it either shows a black screen or nothing at all on the TV. The Ultra C acts like it is connected, but clearly is not. Firmware is on the latest version. Hoping to get this resolved ASAP, since this is a feature I was really hoping to use. Any help troubleshooting this would be greatly appreciated.
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