The Old3DS+New3DS 10.4.0-29 system update was released on January 18, 2016. This Old3DS update was released for the following regions: USA, EUR, JPN, CHN, KOR, and TWN. This New3DS update was released for the following regions: USA, EUR, JPN, CHN, and KOR.
Security flaws fixed: <fill this in manually later, see the updatedetails page from the ninupdates-report page(s) once available for now>.
Old3DS/New3DS browserhax and menuhax were not fixed(the Old3DS browser wasn't even updated).
Official USA change-log:
- Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience
APT added a new command used by menu which now checks whether IronFall is on the latest version before launching; if it is on an exploitable version and the function is called to launch IronFall the system will reboot. This check is done again before launching the title, throwing an error if it fails.