D
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Short Version: MCU bricks were patched out in 8.1 so it doesn't brick anymore through software. The only MCU(?) brick that can be done is closing an N3DS on 2.1 (which you shouldnt even do anymore)
Long Version: MCU bricks are pretty much impossible on 8.1+ fws (8.0 and below are still vulnerable, but you'd have to REALLY be trying to brick it). Version 8.1 added a set of security measures that made bricking the MCU much harder. The only known way you can even break the MCU is through invalid LED patterns, but even those were protected in 8.1. yellows8's MCU bricked 3DS was on a firmware below 8.1. So don't be afraid to make LED homebrew, or use it. It's perfectly safe, and all the effects will go away on a reboot.
Rave lights for everybody!
http://3dbrew.org/wiki/MCU
Long Version: MCU bricks are pretty much impossible on 8.1+ fws (8.0 and below are still vulnerable, but you'd have to REALLY be trying to brick it). Version 8.1 added a set of security measures that made bricking the MCU much harder. The only known way you can even break the MCU is through invalid LED patterns, but even those were protected in 8.1. yellows8's MCU bricked 3DS was on a firmware below 8.1. So don't be afraid to make LED homebrew, or use it. It's perfectly safe, and all the effects will go away on a reboot.
Rave lights for everybody!
http://3dbrew.org/wiki/MCU