Sorry for such a late reply, hope you already know about "Flashing a BIOS chip" article at DangerousPrototypes forums which uses G505S as an example. And another "Flashing KB9012" article is optional and not urgent (since it's not replacing the proprietary KB9012 firmware, just removing the serial numbers from it) so maybe you could wait for this 30-pin cable. I would have happily shared one of my spare cables but I'm concerned about privacy (postal address etc) and the international shipping could cost for me more than simply ordering 10pcs to your address. But your message is pretty old so I hope you got it resolved.
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