Because firmware files for large-screen TVs are often several hundred megabytes, they are frequently compressed into multiple parts (e.g., part1.rar , part2.rar ) for easier hosting.
Do you need help of your IRIS SAT 42E790S to ensure you have the correct firmware files?
: Press and hold the Power button (or sometimes CH+ ) on the TV's physical panel—not the remote.
: The extracted firmware file must be placed in the root directory of the USB drive (not inside any folders). 3. Installation Procedure