Release the button once the "Software Updating" screen appears.
Ensure the firmware you download is specifically for the 24E3500 . Installing the wrong software can permanently damage (brick) your TV. If you cannot find the file on the official site, you may need to check community databases like Scribd's TCL Software repository , but proceed with caution. Download TCL 24E3500 Software rar
Press and hold the on the TV (not the remote) while plugging the power cord back in. Release the button once the "Software Updating" screen