Press and hold the button on the TV while plugging it back into the outlet.
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 Press and hold the button on the TV
: Factory configuration settings. How to Install (USB Method) Press and hold the button on the TV
: A red indicator should start flashing. When it begins flashing rapidly between red and green, the update is complete. Press and hold the button on the TV
: 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.