With the recent 33c3 concluding at the end of last year, came numerous exploit announcements for the 3DS scene, many of which have since been implemented and are in working stable condition. Two of those exploits being soundhax and fasthax, both developed by Ned Will, a prominent hacker of the 3DS scene.
Alongside these many exploits and developers, the 3DS scene also consists of many involved and active community members, which can be noted from the active discussions on their sub-reddit along with the rapid development rate of recent releases.
As of this writing, it is now possible to downgrade all current N3DS models and most O3DS models based on firmware version, using the combos of waithax/svchax/safefirmhax or fasthax/safefirmhax, keep in mind fasthax is still in alpha, well technically beta, though not officially beta as of this writing, but it should be soon, thanks to an active community, many users have implemented and compiled their own versions of the exploit and have had great success for many users in the process of downgrading/installing a9lh+cfw of choice.
Starting with 3DS models firmware 11.1 and lower, fasthax doesn’t support firmwares below 11.2, but there is waithax, which provided you have the patience as the name says, to wait, works flawlessly. A guide for 3DS models below firmware 11.2 can be found here:
Since Plailect has both updated links and instructions.
For 3DS models on firmware 11.2, things get a little complex. Users of these systems can follow reddit user Aurolei’s guide, using a custom fasthax/safefirmhax compiled binary file, that works with any entry point, same as prior.
Keen warning that this current implementation may be unstable as it is not an official stable release, but a community release for those eagers users who would like to downgrade and install the a9lh exploit alongside Luma3DS/NTR or whichever customer firmware of choice is preferred. I have personally downgraded two of my own systems using both exploits and their respectful guides, with absolutely no trouble, exact step by step instructions must be followed, or user errors are likely to cause unnecessary conflicts and errors.