: For Roku-powered models not connected to the internet, use the Roku TV Update Tool to download the .roku installer file directly to a USB drive.
Use a USB drive (16GB or less preferred) and format it to FAT32 . Download Tcl Firmware For All Models
If you want, tell me a specific TCL model number (include region if known) and I will locate the official support/download page and list any available firmware files and the precise update steps for that model. : For Roku-powered models not connected to the