A power cut during flashing can "brick" the motherboard.
The TCL L43D2930S is a 43-inch Smart LED TV that occasionally requires firmware updates to resolve software glitches, boot loops, or app compatibility issues. Firmware for this model is often distributed in multi-part RAR archives due to file size. Technical Overview TCL L43D2930S Download TCL L43D2930S Firmware part4 rar
Plug the TV back into the power source while continuing to hold the button. A power cut during flashing can "brick" the motherboard