The indicator light should begin flashing rapidly, indicating the update is in progress.
To update your board or fix a "hanging" logo using the USB method: to FAT32. Extract the .bin file from your downloaded .rar archive. Download R85 801 1366x768 Samsung USB rar
Note: Do not turn off the power until the flashing stops and the TV reboots. Important: Entering the Service Menu Download R85 801 1366x768 Samsung USB rar
Frequently lists available firmware downloads for various universal boards. How to Install the USB Firmware Download R85 801 1366x768 Samsung USB rar