Do not download firmware from random file-sharing sites (MediaFire, Mega, etc.) unless the link is verified by a reputable forum user. Malware disguised as firmware is common.
firmware, how to check your current system build, and the exact step-by-step methods for updating via OTA network or a physical USB storage drive. Why Update the Firmware of Your TCL 50EP660 firmware tcl 50ep660 upd
Complete Guide to TCL 50EP660 Firmware Update (UPD & IMG Methods) Do not download firmware from random file-sharing sites
Reduces random restarts or freezes.
Go to Settings > Device Preferences > About > Product Information to note your current software version. firmware tcl 50ep660 upd