I read through whole forum and it seems xbox save does not have a crc protection but ps3 save has one,I looked through the game elf(converted from eboot.bin) and here's what I found:
I found the CRC32 table and it is the standard 1,
1st part till the last part
00 00 00 00 04 C1 1D B7 ...(until)... B5 36 5D 03 B1 F7 40 B4
pic below shows this CRCtable is loaded from a function and perform CRC32
pic below saying this CRC32 function is being called several times,and you can see the CRC.bin
weird is why CRC32 result isn't matched,initial value is set..? or there is a particular xor value of final result..? I tried BSD checksum finder,it does not matched no matter what.(bsd crc32 checksum is no problem as I can get the right checksum for other games)
but I can tell
checksum address in CRC.bin: 0x00-0x03
Calculation Range in USERDATA.BIN
Start: 0x00
End: end of file
Files needed are in HERE
contains:
-Prototype 2 decrypted saves(1 is savedata and 1 is profile data),just open with Hex editor to view the data
-Prototype 2 ELF(like xbox xex),just open with IDA Pro to view the data
I need pros help me out about this unknown checksum type. Thanks in advance :)
PS:I do believe Prototype 1 is using the same CRC type.








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