: Use a FAT32-formatted USB flash drive. Copy the extracted firmware file (usually an .img or .bin file) directly to the root directory of the drive. Insert and Update : Plug the USB drive into the TV's USB port.
Give a look here. Anyway i can download the file you were referring to. Software TCL U58S7806S - HDForum Download NT67F02 LF1V498 part5 rar
: Always check the TCL Support Page or the SmartTech TV Download Center for authorized software. : Use a FAT32-formatted USB flash drive
: Technical communities like Elektroda and HDForum are common places where users share specific older versions like LF1V498. How to Install the Firmware Give a look here
Because firmware files are often split into multiple "parts" (like part1, part2, etc.) to accommodate file size limits, you must download from the same source to successfully extract the final .img or .bin file.
Once you have downloaded all parts and extracted the main firmware file: