PS3 Resident Evil 4 HD CRC verification to modify files

Ridertron

Ridertron

Forum Noob
Hello, I'm new here and I hope I'm talking about this topic in the right place, :D anyway.

I've been dealing with the modification of audios and cinematics of RE4 for PS3, and I was able to do several things like change sfx, audios of pre-recorded videos, etc.

But there is a file that has been causing me headaches and it is bio4evt.dat.crc. Although inside it has pure Atrac plus audios
that are easily replaced by injecting new audio into the DAT while respecting the weight of the original audio.

No matter how much I replace an audio, the game hangs, experimenting a bit, I discovered that if I remove the .crc from the file, the game runs the same BUT no audios from that renamed file plays, so that is of no use to me.

But doing some research, I found out on another forum that this game uses a CRC32 file check that analyzes them and if something seems faulty it crashes the game.

And according to what I read there, he did a kind of reverse engineering in the EBOOT.BIN so that the game doesn't do those checks and lets the files run as they are.

So my question is, how can I modify the EBOOT.BIN so that it bypasses those checks and lets me execute the modified files that I made? Any help is appreciated, THANKS
 
Ridertron said:
Hello, I'm new here and I hope I'm talking about this topic in the right place, :D anyway.

I've been dealing with the modification of audios and cinematics of RE4 for PS3, and I was able to do several things like change sfx, audios of pre-recorded videos, etc.

But there is a file that has been causing me headaches and it is bio4evt.dat.crc. Although inside it has pure Atrac plus audios
that are easily replaced by injecting new audio into the DAT while respecting the weight of the original audio.

No matter how much I replace an audio, the game hangs, experimenting a bit, I discovered that if I remove the .crc from the file, the game runs the same BUT no audios from that renamed file plays, so that is of no use to me.

But doing some research, I found out on another forum that this game uses a CRC32 file check that analyzes them and if something seems faulty it crashes the game.

And according to what I read there, he did a kind of reverse engineering in the EBOOT.BIN so that the game doesn't do those checks and lets the files run as they are.

So my question is, how can I modify the EBOOT.BIN so that it bypasses those checks and lets me execute the modified files that I made? Any help is appreciated, THANKS
Click to expand...

Firstly you have to unself/decrypt that eboot.bin then load that elf file into IDA for reversing CRC check..

that CRC check is pretty common on NP version of RE games which include RECV, RE0, RE1 and so on...
 
Joonie said:
Firstly you have to unself/decrypt that eboot.bin then load that elf file into IDA for reversing CRC check..

that CRC check is pretty common on NP version of RE games which include RECV, RE0, RE1 and so on...
Click to expand...

Ok, and what program or executable is that IDA?:pride:
 
Well, I already discovered that it was IDA, and I was able to decrypt the eboot, but I don't know what to do inside IDA with the loaded file.:apologetic:
Personally I have 0 knowledge on the subject of file disassembly
 
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