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If you cannot find the firmware on official websites, contact TCL customer support directly with your TV's serial number and build number.
: Users frequently report that later system updates make the Android interface "painfully slow" or buggy. Inconsistent Apps Firmware TCL 50EP660
Sometimes OTA updates stall or fail. In that case, a manual (USB) installation is required. If you cannot find the firmware on official
Because most TCL TVs are not rooted, a full backup is not feasible for average users. Rely on official firmware files instead. Firmware TCL 50EP660