Below is the complete, safe method to update your TCL TV firmware via USB.
The USB drive acts as the delivery vessel. Do not use a high-capacity external hard drive; use a standard USB flash drive (Thumb drive).
The process requires precision—wrong file, wrong format, or wrong power cycle can ruin your weekend. But if you follow this guide meticulously, you will resurrect a dead TV or unlock performance you didn't know your panel had.
: Specifically use tvupdate.roku.com to download software for TCL Roku models. 2. Update Procedures by Model Type