Unfortunately, you may need to contact the Samsung customer service center in your region. I don't have any knowledge on firmware updates outside of the US, and the customer service center in your region would be more knowledgeable on firmware updates for your specific model number.
Of most of the cases I've seen here, people sometimes forget to unzip the file, or just drag-and-drop it onto a thumb drive. Installing it from a PC desktop to a USB drive is typically how the update is performed.
My LED model is Samsung UA40C5000QR. I download the latest firmware for my LED i do the same steps in the upgrade firmware guide but the LED didn't detect the update from the flash memory i found this message (No file available to upgrade. please check it and try again ). please help me how to upgrade it.