I've seen how running an m4a file can let code execute on the 3DS, and seeing my Internet connections turn into the word "Haxxxxxxxxxx", so how do most of the #DS homebrewing exploits function?
Basically, in some older versions of the system software, the sound player had a bug whereby it could be made to start executing data in a specifically-designed m4a file as code. Lots of media players have had similar problems over the years. (The PSP, for instance, once had a vulnerability that could be exploited by using a corrupted .tiff file.)
and seeing my Internet connections turn into the word "Haxxxxxxxxxx", so how do most of the #DS homebrewing exploits function?
If you're referring to https://3ds.hacks.guide/installing-boot9strap-(usm) , then as it says, it involves injecting "an exploited WiFi profile" - a profile that contains code that the system software can be tricked into executing. (USM in particular makes use of the fact that "safe mode" uses an older version of the system software that was never updated and still has an exploit that was patched out of later versions.)
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