I recently downgraded my N3DS and made nand backups. I bought a microusb port to install but several people insisted to not use usb so I'm currently looking on amazon to buy a different port and cable. I feel like I know where to solder the points to, just need to know where and how to install the port. I looked around and saw some install them on the back of the N3DS behind the back cover. Is there a guide that shows where to install them and how do I make the cut on the back?