It's not unmoddable. It's just that the batterie's wierd

[prolly because it's a newer moddable or whatever]
I suggest you get the smallest type of battery possible when you make it a pandora, so you don't waste that much money.
Anyways, just look for an "ICO" or an "ICO4" prints on that top motherboard area where you flipped it up. I think the location is messed up, that's all.
When/If you find the ICO, look for the 5th pin. It's usually the bottom-right pin. Pull it up with a needle, and you're set