Look for universal firmware packs on lcd tv led tv smart tv software , which frequently hosts VS.TP53U73.2 files.
The firmware is often distributed as a .bin or .rar file. You can find community-sourced software at the following locations: Download TP53U73 1366x768 USB rar
the TV; the standby light should start blinking, indicating the update is in progress. Look for universal firmware packs on lcd tv