: Sites like 4PDA or Remont-aud are common repositories for these specific .rar parts. Search these forums for the exact thread title "RT2861V09 3840x2160 16G Kivi 49UP50GU" to find the missing part 5. Critical Safety Steps
: Format your USB drive to FAT32 before copying the extracted .bin or .pkg file. Download RT2861V09 3840x2160 16G Kivi 49UP50GU part05 rar
: Ensure you have part01 through part05 (or however many exist) in the same folder before attempting to extract. : Sites like 4PDA or Remont-aud are common