: The process can take 5–15 minutes. Do not power off or unplug the TV during this time, as it can permanently damage the mainboard.
Download the provided files. If they are in multiple parts, ensure you have every part before attempting extraction. Installation Guide (USB Method) Download RT2851V09 3840x2160 Kivi 55U730GU part08 rar
Once you have the extracted firmware file (typically named MstarUpgrade.bin or similar), follow these steps to install it: : The process can take 5–15 minutes
: Press and hold the Power button on the TV (not the remote) for 5–10 seconds until the standby LED begins to blink rapidly, indicating the update has started. If they are in multiple parts, ensure you
Enter your TV's Serial Number (found on the back panel of the TV) to ensure the software matches your hardware revision.
If the TV is stuck on a black screen or boot loop, the provides detailed power charts and voltage checks for components like the UP3D1 (3.3V) and U1D1 (1.0V) regulators.