Ensure you have downloaded all parts of the firmware.
Based on user reports for similar TCL firmware updates (such as V583), these updates are generally highly recommended over factory-installed versions like V509. Download NT67F02 LF1V614 part1 rar
Copy the extracted file (usually a .pkg or .bin file) onto a FAT32-formatted USB drive. Ensure you have downloaded all parts of the firmware
Users report that newer firmware versions significantly improve overall UI responsiveness, often described as "night and day" differences. Download NT67F02 LF1V614 part1 rar
Insert the USB into the TV and follow the system update prompts in your TV's settings menu.
Use a tool like WinRAR or 7-Zip to open part1.rar only; it will automatically pull data from the other parts to create a single folder.
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