You might've changed the region of your 3ds..the ctrt transfer worked but my ds was in the wrong language
What guide were you following? Certainly not this?so i followed another tutorial
Well you should. Back up your sd card data somewhere safe on your pc, empty the sdcard, and run h2testw with the "read and verify" setting. It should tell if it's ok to use, or if it's faulty in some way.i havent checked for sd card errors
I'm telling you to do this because of the error you're getting, if the sd card was faulty maybe the ctrtransfer image you transferred was corrupt in some way. Again, better check to make sure it's not faulty, or else it'll sure make things complicated in the future.