Over on the QJ forums, jas0nuk has just released a psardumper mod that can decrypt individual firmware modules from all known retail firmwares (from 1.00 all the way to 3.03). The mod, dubbed decrypter303, also works with all current game PRXs.
Installation
To install decrypter303, first create a folder on your memory stick named "enc" and place your encrypted PRXs there. Then run the app and press X to decrypt them. The encrypted files in the "enc" folder will be replaced with decrypted versions.
Decrypter303 can also extract reboot.bin from a 1.50 loadexec.prx or later. Here's how:
1. Place a decrypted 2.60 or later sysmem.prx in the "ms0:/enc" folder and name it as "sysmem_reboot.prx".
2. Place a decrypted copy of loadexec.prx from the firmware you want reboot.bin for, and name it as "loadexec_reboot.prx".
3. When these two files are detected, an option to obtain reboot.bin (done by pressing the square button) appears in the application.
Limitations
* It is impossible to decrypt *sigchecked* firmware files as they are entirely different from their unsigchecked counterparts. Just compare the two in a hex editor and you'll see what I mean. It might be possible to un-sigcheck these files if I bother to reverse the sigcheck process. But for now, it's not possible.
* Cannot decrypt game EBOOT.BIN files. You will get an "unknown tag C0CB167C" error. This is because they use a different encryption. I might add this for the next release.
* Cannot decrypt a few huge PRX files as they are encrypted with RLZ. I will fix this for the next release.
Jas0nuk says that v1.10 is already on its way, so keep your eyes here on QJ for more updates. Be sure to read the readme file included in the download in order to ensure that you install this homebrew app correctly.
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