Yep, just as I thought. Soundhax is now officially patched in 11.4 and cannot be fixed, even if the .m4a file is edited in some way, which means it is now completely obsolete (for those trying to use an ARM11 Userland exploit to launch HBL). For anyone that is on 11.4, doesn't have A9LH and wants to launch HBL through an ARM11 Userland exploit will now have to rely on working 3DS savegame exploits, until a new vulnerability in a system app has been found (eg. Nintendo 3DS Camera). I know it's going to be a lot of effort to inject a save onto a game card, if you don't have any 3DSs with older firmware. For those that are stuck in that sticky situation, you have two options: buy a game card with the hacked save exploit on it, or buy a 3DS with firmware 11.3 or lower (which is best to be bought now, before the update becomes too widespread to find one lower than 11.3). But even when the otherapp payloads for 11.4 O3DS are released, anyone without save exploits on their system are going to have a difficult time trying to find an easy way to launch HBL through ARM11 Userland.
As for anyone who has A9LH and a CFW, make sure you're using a CFW that is frequently updated, and update your CFW (whenever it either be Luma3DS hourly build or Corbenik nightly builds) before updating to 11.4.
However, if you're updating to 11.4 with CFW, please keep in mind that TWL_FIRM and AGB_FIRM are not functional in any current working CFW. Because TWL_FIRM and AGB_FIRM doesn't work in any working CFW, this means you won't be able to play the following:
- Nintendo DS games (no matter if they're legitimate game cards or not)
- DSiWare (no matter if they're ones that have been obtained via eShop, freeShop or system transfer from your Nintendo DSi)
- Virtual Console Game Boy Advance games (since it relies on AGB_FIRM operating system emulator to run)
And as for the Gateway team, they are too late. By the time they release the quick fix for 11.3, Gateway emuNAND still won't work on 11.4. Nintendo is one step ahead of them. The Gateway team should do us a favour, and release a .cia version of their flashcard functions and accessibility that works in a similar way to NTR CFW, in that it runs in the background, instead of expecting everyone to run a full emuNAND under their full CFW. They should release a mini CFW app as well. So it can benefit everyone, without needing to replace other CFW running on the system.