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LED 1 = Standby power LED 2 = Power on the Motherboard LED 3 = Video card detected LED 4 = LCD detected
820-3199-A is the IO Board for the motherboard 820-3462-A
Tiresias (the GPUkiller) The Tiresias is a small board that can be soldered onto the motherboard of the MacBook Pro 15-inch or 17-inch 2011...
This ROM is the firmware for the T2 chip. It is NOT the BIOS rom. The BIOS is probably stored in the Flash itself.
The CMIzapper Medusa can read the ROM in some Macs without power connected. Not in all models but often it does work.
One option is to solder the ROM onto the CMIzapper Medusa Lever Shifter board. This enables 1v8 ROMs to be used on a 3v3 system like the Medusa....