Answer to: How do I fix my 3DS Error Problem?Forgot to respond to my previous comment. I bought a replacement Wifi card, and it came in the mail a few days later. Opened up the 3DS again, pulled out the old card, put in the new, and WAMMO, wireless functions worked again. Thanks iFixit!
Answer to: How do I fix my 3DS Error Problem?So I got it open, detached and re-attached the wifi card, put the battery back in, and STILL it crashes when the wifi is turned on. I know you can buy replacement wifi cards for ~$10, but I'd rather fix it instead of replace it. Plus, waiting on shipping would be less than ideal. Any suggestions?