: Use a PC to format your USB flash drive to FAT32 .
: Plug the USB drive into the TV's USB port (prefer USB 2.0 if available). Download IRIS 43G7200 Firmware part4 rar
: Use a tool like WinRAR or 7-Zip. Right-click on part1.rar and select "Extract Here." If all parts (including part4.rar) are in the same folder, it will automatically combine them into a single file (usually ending in .bin or .pkg ). : Use a PC to format your USB flash drive to FAT32