This article is your complete resource. We will walk you through why firmware updates matter, how to perform them via internet or USB, what to do when things go wrong, and how to troubleshoot common post-update issues.
The TV will reboot, possibly multiple times. After the final reboot, your firmware is updated.
Look at the back of the TV for a white sticker. Note the exact model number (e.g., Soniq QSP4KT55).
And that someone else waved.