After completion, the TV will boot normally. Remove the USB drive and perform a (Settings > Device Preferences > Reset) to clear any residual conflicts.
Download the correct .pkg or .zip firmware file tailored specifically for the L40S6500 and its regional board. Extract it to the root of a FAT32 formatted USB stick.
Accessed by setting image mode to "Standard", selecting "Contrast", and typing 6425 or 9735 on the remote.
: If the firmware update doesn't fix performance issues, you can perform a hard reset by holding the physical button on the side panel for 12 seconds. Official Support
If you need to check deeper hardware information, you can often access the service menu by going to Settings > Picture > Advanced Video > Contrast and entering the code 6425 on your remote.
You have the file. Now, how do you install from a USB drive? This process is known as a “forced update” or “recovery flash.”
The firmware package for the L40S6500 typically contains: