Always back up your original firmware before overwriting it.
If your TV still powers on but has software issues, follow these steps: Use a 4GB or 8GB USB drive formatted to FAT32 . Download TSUMV56 MSD3553 T5C1 1366x768 Ecostar Dump rar
Plug the TV back in while holding the button until the LED starts blinking (indicating the update has started). Always back up your original firmware before overwriting it
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A "Dump" file is typically for an EEPROM programmer (like RT809F). If your TV is completely dead (no light), you must desolder the flash IC and use a programmer to burn the file.