50ep660 — Firmware Tcl

The TCL 50EP660 runs the Android TV or Google TV operating system. Unlike older TVs, firmware updates are delivered automatically over the internet . You rarely need to manually install firmware via USB unless the TV is bricked, stuck in a boot loop, or the automatic update fails.

If you want a newer OS, consider an external streaming stick (Fire TV 4K or Chromecast with Google TV) and leave the TV firmware on a stable, frozen build. Firmware TCL 50EP660