As long as you read it carefully and follow it word for word you should be fine. There are some cases of bricks but mostly for N3DS. I did this on my N3DS XL and was scared the whole process. But in the end I got my OTP.bin and am running a9hl with reinandJust finished reading the guide for a9lh o3ds and 2ds and woh, i don't know if i can do it.
