FOR THE LOVE OF DOG, PLEASE DO YOUR RESEARCH BEFORE TRYING TO DOWNGRADE. The first step of this process is to get some of this: https://en.wikipedia.org/wiki/Common_Sense_(pamphlet) Once you have your trusty Common Sense™, I advise visiting one of the numerous threads that have popped up explaining why bricks may happen. This will show you the most common and preventable methods of bricking, and will also give you insight on how your model of 3DS and currently installed firmware may react to the sysUpdater. According to the to the Reddit thread, apparently a few people got Memchunkhax2 to reliably work on Old 3DS models. New 3DS models are untested and you encroach a dangerous realm of bricked devices if you install important files just willy-nilly. It is very much recommended that you have a hardmodded device so that you can install a NAND backup of your system in case of failure. If you hard brick your device without a modchip to restore a backup with, you are SOL. For instructions on how to downgrade, go here, where Sgt. Lulz has written a very good set of instructions below the MenuHax tutorial.. If your console bricks but you can boot into recovery mode by holding down the following combination of keys: A+R+L+Up(DPad). This is a softbrick. You have dun goof'ed, but the Nintendo gods have chosen not to punish you for your insolence. Be grateful, return to System Menu 10.3, and wait for a safer method to arise. If your console bricks and cannot boot into this recovery mode, you now have a hardbrick. There is not a way to solve this without ordering special hardware online to mod your 3DS. If you successfully downgraded, woo! You are very lucky. Go through and ensure everything is functional, as some have reported the NATIVE_FIRM (aka the part of the system menu version that controls what software can run) isn't written to. I usually don't respond to stuff, but I'm currently lying in bed and have not being feeling well, so perhaps I'm a bit curmudgeonly SO PLEASE, STOP MAKING THREADS. YES, YOU BRICKED IT. GET OVER THE FACT THAT YOU DID SOMETHING YOU DIDN'T UNDERSTAND OR THAT YOU GOT UNLUCKY.