First take a look into your system's device list. The USB device should present itself as a "SE Blank Ringo" device. Also, please give a bit more information about the state of your device - how did it went into a brick?
Also note that there is a lengthy thread about unbricking K3s using this method: https://www.mobileread.com/forums/sho...d.php?t=186076
You should read it and make a few conclusions about your Kindle yourself, maybe ask your question there (but then, you've opened this thread, and probably further discussion will follow).