In the recent talk by Smea, Derrek and Plutoo we learned about a new hack called SNShax
News
User JustPingo is doing testing of this exploit, he needs N3DS users with a hardmod to help with testing, he may have already gotten his tester(s), so don't be disappointed if he already has them, that just means it should be out soon.
Tl;dr
SNS means Safe Nintendo Shell, and the hax possible with it can be used to downgrade from 9.3-10.1 down to 9.2, and it is currently only possible on a new3ds, though Smea has said it may be possible on old3ds with a workaround. It was patched in system version 10.2
Vuln
SNShax is a small oversight by Nintendo, usually the NS service (possibly meaning Nintendo Shell, though that is speculation) is in an area inaccessible to the GPU, meaning gspwn isn't useful for using it. However the new3ds safemode version of NS can be launched and, since the original NS service is still in use, it has to be allocated in an area accessible by gspwn (provided the memory is set up properly) and access can be gained, with ROP, to the services it uses (am:u and others) which, in turn, can be used to downgrade. It is not possible on the o3ds (yet) as the Safe Nintendo Shell version the o3ds uses is prevented from launching while the standard version is still running. This wouldn't be a problem if NS wasn't required to start any version of itself up.
Uses
As stated above it is possible to use this to downgrade any system title, in turn allowing full system version downgrades. This makes it possible to downgrade to any system version which we have legit CIAs for.
Q&A
Q: I have an O3DS on 10.1, should I wait for a workaround?
A: That is up to you, however memchunkhax 2 will probably be out before this and will be able to access am:u and downgrade your system
Q: I'm on a system version below 10.1, do I have to update?
A: No, this will work on system versions 9.3-10.1 (and maybe lower versions than that)
Q: I'm on system version 10.2/10.3, am I screwed?
A: No! Memchunkhax 2 works from 9.3-10.3! Just don't update beyond that or you're going to be back in the same boat
News
User JustPingo is doing testing of this exploit, he needs N3DS users with a hardmod to help with testing, he may have already gotten his tester(s), so don't be disappointed if he already has them, that just means it should be out soon.
Tl;dr
SNS means Safe Nintendo Shell, and the hax possible with it can be used to downgrade from 9.3-10.1 down to 9.2, and it is currently only possible on a new3ds, though Smea has said it may be possible on old3ds with a workaround. It was patched in system version 10.2
Vuln
SNShax is a small oversight by Nintendo, usually the NS service (possibly meaning Nintendo Shell, though that is speculation) is in an area inaccessible to the GPU, meaning gspwn isn't useful for using it. However the new3ds safemode version of NS can be launched and, since the original NS service is still in use, it has to be allocated in an area accessible by gspwn (provided the memory is set up properly) and access can be gained, with ROP, to the services it uses (am:u and others) which, in turn, can be used to downgrade. It is not possible on the o3ds (yet) as the Safe Nintendo Shell version the o3ds uses is prevented from launching while the standard version is still running. This wouldn't be a problem if NS wasn't required to start any version of itself up.
Uses
As stated above it is possible to use this to downgrade any system title, in turn allowing full system version downgrades. This makes it possible to downgrade to any system version which we have legit CIAs for.
Q&A
Q: I have an O3DS on 10.1, should I wait for a workaround?
A: That is up to you, however memchunkhax 2 will probably be out before this and will be able to access am:u and downgrade your system
Q: I'm on a system version below 10.1, do I have to update?
A: No, this will work on system versions 9.3-10.1 (and maybe lower versions than that)
Q: I'm on system version 10.2/10.3, am I screwed?
A: No! Memchunkhax 2 works from 9.3-10.3! Just don't update beyond that or you're going to be back in the same boat
Last edited by dark_samus3,