If your TV's mainboard is completely unresponsive, a standard USB update won't work, and you will need the specific or .hex dump for the W25Q32F chip.

While "flash dumps" are usually found on third-party technician forums, Samsung provides official that can resolve software-related bugs without needing a hardware programmer. Model: Samsung UA32FH4003R

Version 1040.0 (Released Apr 20, 2016)

Follow the official guide to update via USB if your TV still powers on. 2. Technical Flash Dump (W25Q32F)