Long story short - I put my sd card into my computer (MacBook) to back up my saves and put it back into my 2DS XL last night. I went to go into AC:NL today and the game wouldn't show up on my system/ said sd card couldn't be read. So I went back and deleted everything off of my card and reformatted it and put my saved data back on and now its telling my the game is trying to load isn't the last save and won't load my town Is there anything I can do or am I stuck restarting??? I just got the game and new ds for christmas and I'm so sad if I already have to restart!!
unfortunately it sounds like you're going to have to restart at least you haven't made years of progress.
for future reference when this happens, usually all you gotta do is turn the system off, take the SD card out and put it back in again. messing with the save file on your computer is a bad idea unless you know exactly what you're doing. there are a lot of checks in place to prevent potential piracy.
Visit my dream towns!
Angie from Maplerow, Ranae from Wayfield and Olive from Yorkwood