SD Card Write Protect Jumper

I’ve been having the Write Protect error on my 3DS since 2011 after putting the SD Card in upside down. I recently took it apart to try and fix it and found a thread on here where someone described putting a solder blob on two pads to make the 2DS think it’s not write protected. I have no idea where these pads are on the original 3DS. Can anyone point me in the right direction?