Based on common community resources for IRIS SAT firmware, you can look for the complete set at these sites:
: A well-known repository for LED TV dump files and firmware. You may need a free account to access specific download links. Download IRIS 49E700A Firmware part3 rar
: An extensive technical site for TV repairs. Searching their database for the board number (e.g., CV338H-A42) often leads to the correct firmware parts. Based on common community resources for IRIS SAT