While the rate of bricks from installing CFW is almost non-existent I am in no way responsible for whatever you do to your 3DS.
Follow my tutorial exactly as said and you should be fine, If you have issues look in the Troubleshooter!
IMPORTANT:
This tutorial is generally only for o3DS. You can probably find out what to do on n3DS but I am giving no support for...
Installing rxTools 9.2.0-20 w/ Unlinking - Updating - Online Access