If you are looking for the tool, it is primarily used for flashing and recovering digital satellite receivers, specifically those utilizing the GX6605S chipset.
Use saved searches to filter your results more quickly * Issues 2. * Pull requests. Retro Rewind - Custom Mario Kart gx downloader boot v1 032 link
A: Do not input it. Legitimate tools never ask for private keys. GX Downloader Boot V1