For a walkthrough on how to flash this specific type of firmware via USB, technical tutorials are available on Zainab Tech's YouTube channel . Important Precautions
MSD6A628-T8E3 (often associated with brands like TCL and other budget smart TV manufacturers).
service manual - tcl msd6a628-t8e-6 main board - Elektrotanya
A .rar archive, which is part of a multi-volume set (indicated by "part3"). You must download all parts (e.g., part1, part2, part3) to successfully extract the final firmware file. Where to Find the Software