xport2 checksums

**Harris7** · 05-16-2007,12:52 PM

hi guys
i've been trying to hex edit some of my ps2 .xps game saves, i've found the offsets for a good part of the stats i'm trying to edit (hp exp items ect) but every time i edit anything it ends up corrupt when i try to load the save

i know this is because of the checksum, but all i really know about it is that it somehow adds up everything in the file and comes up with a number

anyone know how these things work and/or how i can re-check? the file when i'm done to fix it?

and i know there's a checksum fixer on a different site (dunno if you can plug sites here....a place for save tools for ps2

) but it makes little sence to me

can anyone help me out?

**amp2006** · 05-16-2007,01:19 PM

please do NOT DOUBLE POST..

thanks

**Harris7** · 05-16-2007,01:41 PM

wasn't intentional, tried to delete the double

**gothi** · 05-16-2007,02:23 PM

What save are you trying to edit? Some games are not compatible with Xport saves, the GTA series being one of them. You also want to be working with the raw save files, not the Xport container, use PS2 Save Builder to extract the files and again use it to rebuild the save (easiest to just replace the file you edited without closing PS2 Save Builder).

Checksums can be easy or a complete nightmare, I found the FFXII very easily but some use custom algorithms that can be hard to recreate.

**Harris7** · 05-18-2007,07:36 PM

it's a save from an rpg i happened to pick up, xenosaga 2.
at first i was in the container file, not now thou...i'm going to fool around with it more today and see what i can get
i have two saves with very minimal differences to compare so maybe i can figure it out

**Harris7** · 05-19-2007,02:45 AM

i figure i'll put the files out here and see if anyone comes up with anything if they have the spare time.
the changes were that i used an item twice (went from haveing 4 to haveing 2, offset 26a0) to gain 60 skill points (496 to 556 offset 227c) everything else seems to have been done by the game on it's own...all i did was load use two items and save again.
i'm assumeing the checksum is 3164-3167 as this is the last place that the files are different from eachother.
any help is greatly appericated, thanks for your time

first save can be found here
http://media9.filewind.com/g.php?filepath=11878
second one here
http://media9.filewind.com/g.php?filepath=11879

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