>>237196>hardmoddingheh.
When I were a lad, "hardmodding" was permanently connecting a modchip to the console, and merely fiddling with the BIOS was considered "softmodding".
Anyhoo, you don't need to solder shit, sewing pins and blutack will do fine. All you're doing is reading out a flash chip using testpoints that are deliberately designed to be connected to without soldering. Even if the connection is flaky, it doesn't matter because SD is designed to work over flaky connections and has error correction built it.
Think about it: when you put a microSD in your phone, you don't solder it in, do you?
In the factory, the flash chip is programmed by sitting the motherboard down on a pogopin jig (the exact way you'd sit a PS3 Move down on its charger), and programming it through pogopins that just push against the testpoints. That's what they're for.
I still find it bizarre you can't get a third-party pogopin jig for the 3ds the way you can for xboxes and playstations; I imagine it's because you lot are all ascared to even take the back off.