If you are missing Part 3, you may find community-uploaded files on specialized technician sites:
" typically indicates a multi-part archive download where all parts are required to extract the final update file. Because firmware is model-specific, using the wrong version can permanently damage your device. Download IRIS SAT 42E710S Firmware part3 rar
Are you experiencing a like a "stuck on logo" screen, or are you just looking for a feature update ? How to update any Samsung TV's firmware using a USB drive If you are missing Part 3, you may
the TV during the process, as this can brick the device. Where to Find Firmware Files If you are missing Part 3