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My Gnet with the back up board

JP1: open
JP2: closed
JP3: open
JP4: closed

JP1 is used for re-flashing the bios so I'd suspect it's not relevant to the backup board.

keep in mind there is also an optional network board (used by RC de Go, I'm not sure what others) so it's possible jumper settings are different when that is present as well.
 
so the next thing is to find what jumpers 2,3,4 connect with.
 
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