If the TV is under warranty, contact before attempting manual flashing.
If you are a power user, you can explore (e.g., “Mickey” or “Alpha” builds) that debloat the TV and improve speed. However, these are not official and carry a risk of permanent damage. Firmware TCL L43S6500
TCL L43S6500 (part of the S6500 Series) runs on the Android TV If the TV is under warranty, contact before