TCL-LED40B3810F-FIRMWARE FREE DOWNLOAD Brand Tcl Smart Led Tv Model : LED40B3810F Main Board  40-ORT49S-MAB2HG  RT49S Resolution 1920*1080  Full hd Usb Updatable firmware To update this software extract rar file and copy. img file in fat32 formatted usb plugin usb to tv press and hold power button on side touch and plugin power