If your TV is frozen, won't turn on fully, or the network update fails, you must flash the firmware manually. Get a USB flash drive (formatted to FAT32 ).
Sometimes, checking system parameters or resetting image alignments requires accessing the developer service menu. You can do this by using secret remote codes. 42.5" TCL L43S6500 - Specifications - DisplaySpecifications Firmware TCL L43S6500
While holding the button, plug the power cord back into the wall. If your TV is frozen, won't turn on
Protects your device and home network from vulnerabilities. Methods to Update TCL L43S6500 Firmware You can do this by using secret remote codes
If your television still boots and connects to the internet, use the built-in update mechanism. This is the safest method. Connect your TV to a stable Wi-Fi or Ethernet network. Press the (gear icon) button on your remote. Navigate to Device Preferences > About . Select System Update and then choose Network Update .