Section II - Installing arm9loaderhax
Reinsert your SD card into your 2.1.0 3DS
Go to http://dukesrg.github.io/2xrsa.html?arm11.bin on your 3DS
I did this step and now my 3ds only flashes a blue light if the SD is not in and gets stuck with a black screen with the SD in. I shut down the 3ds...