mainboard can be found on Elektrotanya . This site often hosts firmware dumps uploaded by technicians.
: Technical documentation and troubleshooting guides for the HK.T.RT2851V09 Download RT2851V09 3840x2160 Kivi 55U730GU part05 rar
: You will need to select your TV model from the dropdown list and enter your serial number (only characters after "KIVI"). mainboard can be found on Elektrotanya
Copy the extracted firmware file to the of the USB drive. Download RT2851V09 3840x2160 Kivi 55U730GU part05 rar
: This ensures you receive the exact build version compatible with your panel and motherboard, preventing a "brick" scenario. Community & Troubleshooting Resources