If the system doesn't recognize the file, try a different USB port or re-format the drive using a different tool.
If the TV remains black during the update, check the indicator light. A flashing light usually means the update is in progress.
Download and extract the .rar or .zip file. You should see a file with a .bin or .img extension.
Common configurations include 512MB or 1GB of RAM and 4GB to 8GB of EMMC storage. Installation Guide via USB