If they are marked with densities like K4B4G1646D (4Gb = 512MB) or similar, you have the 512M variant.
This is an advanced rescue method – seek professional help if you are not comfortable with serial interfaces. cvte-msd338-512m software download
If your TV still boots and is connected to the internet, this is the safest method: Navigate to Device Preferences System Update and choose Check for update 2. Manual USB Recovery (Flashing) Use this if the TV is stuck on the logo or "bootlooping": Format a USB Drive: Use a drive smaller than 8GB, formatted to Prepare the File: Download the firmware (usually a file named MstarUpgrade.bin update.zip ) and place it in the root directory of the USB drive. Flash the Board: Unplug the TV from power. Insert the USB drive into the TV's USB port. Press and hold the Power button on the TV (not the remote). If they are marked with densities like K4B4G1646D
If possible, use a programmer (like an RT809F) to back up your current firmware before attempting a USB update. Software Download Sources Manual USB Recovery (Flashing) Use this if the