❌ If nothing happens, your TV booted normally: try a different USB port, reformat to FAT32, or re-download the firmware.
Technically, yes—if you have an older update.img file. However, TCL’s bootloader prevents downgrading to a version older than the factory-installed one. Attempting to force it via USB will result in an “Anti-rollback” error. Unless you have rooted the TV, don’t try. Tcl Tv Software Update Usb