Go to > System > System Update and select Network Update .
Once you have extracted the software, follow these steps to update your TV manually: : Format a USB 3.0 drive to FAT32 . Download TCL L32S4900 Software part5 rar
For specific issues like Netflix pixelation or the TV being stuck on a logo, you can also find dedicated firmware versions on enthusiast forums like NewTodoFirmware . Go to > System > System Update and select Network Update