Do not download EXE files from random YouTube videos. For the TCL L40S6500, use these three sources:
Updating the firmware on your is generally recommended to improve system stability, fix bugs, and ensure app compatibility. While newer firmware versions like v650 for Android TV aim to optimize performance and security, users have reported mixed results regarding speed and interface responsiveness. Performance Improvements & Features
(depending on chassis):
Before seeking firmware, note the following details from the sticker on the back of the TV:
are often praised for their consistent performance on this specific hardware. The "Best" Firmware Options