Message to the iDevice jailbreak/security/repair communities: Y'all kind of suck at this whole documentation thing. Message to everyone else: don't worry, I'll be publicly documenting everything I find.
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Like I just wasted 45 minutes looking into a "magic" iDCSD "serial" debug cable for Type C iDevices, only to conclude after finding clear photos that it's a standard USB3 Type C cable. With an FTDI on the USB2 pins driving 3 LEDs. And the UART pins disconnected.
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None of this is explained in theiphonewiki article for it, which claims this cable actually serves a purpose. AFAICT it's literally just a passive USB cable plus blinkenlights so that factory workers can see it light up green when tests pass.
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And yet if you Google this thing clearly dozens of people are buying these and excited and think they... do something?! I don't even. Like literally if you look at the wires, the cable coming from the type C end bypasses the FTDI PCB entirely.
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End of conversation
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this only applies to the usb c dcsd though. i believe the lightning one contains a chip with a special debug code which gets recognized by the device's tristar chip and then serial communication is opened
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