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FX3 upgrade gone wild
The stable version of FX3 image file can be downloaded from this location (FX3 build# 45 for production version of Gen 3 camera).
If things go real bad during an FX3 firmware upgrade and all attempts and loading a functional binary image onto the camera the last resort is to download a really old SUB2r firmware update utility and follow the instructions in the video.
Windows driver
Information and download instructions about the current Windows driver to access camera's chipset can be found here.