What brand is your SD card? Did you really format your SD with 32kb cluster size? If your SD card still won't work, try the 4GB SD card that was included in your 3DS when you bought your console (FAT32 format + 32kb cluster size). I can confirm that this SD card works.I tried this and it didnt change anything, I have a 32gb card is that ok?
Also, use my sysUpdater attached to this post. Then update to 10.3 and downgrade to 9.2.