A power cut during flashing can "brick" the motherboard.
Release the button once the "Software Upgrading" progress bar appears. Download TCL L43D2930S Firmware part4 rar
Copy the extracted firmware file (usually Update.pkg ) directly to the root directory of the USB. 2. The Flashing Process Power Off: Unplug the TV from the wall outlet. A power cut during flashing can "brick" the motherboard