stb_upgrade_tool_v40.2.exe -p COM3 -b 115200 -f firmware.bin -verify
: Common sources include Scribd's Firmware Guides for manual instructions. stb upgrade tool ver 40 2 link
A standard 9-pin or 3-pin cable depending on your STB model. stb_upgrade_tool_v40
: Be wary of using manufacturer software on "clone" devices, as this can result in authentication failure and make the device unusable. Official Sources stb upgrade tool ver 40 2 link