Before downloading any file, it is critical to understand TCL's firmware terminology.

Warning: Do not download firmware for TCL 55EP660, 43EP660, or other models without verification. While they may share a similar name, the panel drivers and bootloaders differ. Using the wrong UPD file can permanently brick your TV.

Before diving into the “how,” let’s cover the “why.” TCL releases firmware updates for three primary reasons:

Updating firmware carries inherent risk. A power outage during the 5–10 minute installation process can corrupt the TV’s flash memory, potentially requiring a main board replacement. Therefore, experts advise:

Moreover, owners should be wary of third-party firmware sites. Unofficial builds for the 50EP660 (often claiming to unlock advanced features or remove ads) have been known to break HDMI-CEC control or disable the TV’s local dimming logic.

Method A: USB Local Update (Recommended)

Method B: Recovery Menu (If TV is boot-looping)