OK yall. Get this before u start asking things about downgrading. NOTE!!! You don't need to downgrade if u have se-c for sure(others idk). copied this from above to make it easier to understand what I put at the end of this post.
Quote:
1) First decrypt firmware 2.71 DATA.PSAR with PSAR dumper by pressing square.
2) Copy the audio.prx from F0/kd/audio.prx and save it somewhere safe.
3) Delete the F0 folder that was generated.
4) Decrypt firmware 2.82 DATA.PSAR with cross (X). I don't think you can use another person's dump because of the fact that the signature check is unique to each psp's hardware (I'm not sure).
5) COPY THE 2.71 AUDIO.PRX to the NEWLY generated F0 folder and then ransfer the F0 folder to dh/282/ in your PSP memorystick.
6) Boot devhook and first remove any Flash1 files using the Flash ROM option.
7) Using the Flash ROM option again, RE-FLASH the new Flash1 config files that come with the devhook download.
8) Make sure firmware 2.82 is chosen and without changing any other settings, START!!!
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From Superman57
Frome me:
Do those but with the 2.71 audio.prx file, paste it over the new one. Like in the new X:\F0\kd folder. Replace the new one that was created (just browse around till u find it.) Once u clear flash and restore it like it says above. Your sound WILL work if you do it correctly. but every time u emulate 2.82 with devhook, it will ask u like language and time and that stuff, but it works lol. Hope this helps!