Copy the extracted file to the root directory of your USB drive. Plug the USB into the TV while it is powered off.
For the safest experience, it is recommended to download software directly from the manufacturer: Download RT2861V08 3840x2160 Philco part4 rar
: This identifies the specific mainboard model (also known as a chassis) used inside the TV. Multiple TV brands, including Philco and Kivi, often use this same internal hardware. Copy the extracted file to the root directory