in short, your client doesn’t understand the autopwn command… it is not included in your client software.
to ensure you are absolutely using both the latest firmware features and the same client version, firmware version, and bootloader version, you need to learn how to compile and run from source code.
you are on windows, so you will definitely benefit from running a linux proxy. i use proxspace. the process for downloading and installing proxspace, and downloading and compiling the iceman firmware and client software are all laid out here;