The firmware you are looking for is likely the for the Polarline 43PU11TC-SM TV. This model utilizes the TP.MT5522S.PC822 mainboard and supports a 4K (3840x2160) resolution. Firmware Details & Sources
If you have successfully downloaded the archive parts and extracted them, follow these standard steps for : Format a USB flash drive to FAT32 . The firmware you are looking for is likely
: Place the firmware files (unzipped) directly into the root directory of the drive. Initiate Flash : Unplug the TV from power. Insert the USB drive into the TV. the update is complete.
: Factory configuration settings. How to Install (USB Method) The firmware you are looking for is likely
: A red indicator should start flashing. When it begins flashing rapidly between red and green, the update is complete.