UPDATE:

What has been confirmed:

Memchunkhax2, the kernel exploit used mostly for downgrading and to install legit CIAs, has been patched



Browserhax does not work on New 3ds

Ironhax is effectively dead, due to the system requiring you to update it to its latest version before being allowed to launch it: Only affects Ironfall (https://www.3dbrew.org/wiki/APT:IsTitleAllowed)

oot3dhax, and ninjhax still work once you update payloads

Browserhax still works on Old 3ds

rxTools emuNAND and reiNAND are safe to upgrade to 10.4 on old 3ds



reiNAND 3.1 works with 10.4 in emuNAND on New 3ds (Cornholio309)

eShop is still accessible on 10.3 through Hans on Old 3ds (Captain_N)

Gateway 10.4 emuNAND works with updated Launcher.dat (chizco06)

APT:IsTitleAllowed has titles and versions hardcoded into NS system module, meaning they won't be able to block any more game save entry points without another system update (Steveice10)

Currently unconfirmed:

Status of Menuhax for Old 3ds



Status of Smashhax

looks like nintendo snuck in some exploit mitigation in 10.4, in the form of limited physical layout randomization for certain titles — smea (@smealum) January 20, 2016

this is the reason why HANS takeover of eshop doesnt work under 10.4. that much is fixable, but basically this will make it more annoying. — smea (@smealum) January 20, 2016

actually screws with my plans for hax 3.0 ! might also screw with other entrypoints like menuhax/browserhax. there are solutions. we'll see! — smea (@smealum) January 20, 2016

(so i do recommend staying on 10.3 if that's an option. ninjhax/oot3dhax are still mostly fine on 10.4 fwiw) — smea (@smealum) January 20, 2016

F.A.Q.