: A detailed power chart and board-level troubleshooting PDF for this KIVI model is available on Scribd , which can help verify if a software update is indeed the solution for your specific issue (e.g., black screen or boot failures). General USB Update Procedure
Insert the drive into the TV's USB port (preferably USB 2.0). Download RT2851V09 3840x2160 Kivi 55U730GU part05 rar
: Technical documentation and troubleshooting guides for the HK.T.RT2851V09 : A detailed power chart and board-level troubleshooting