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05-03-22 05:22:56 AM
Jul - General Game/ROM Hacking - Repairing a corrupt FF4DS save? New poll - New thread - New reply
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Dwedit
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Posted on 07-25-08 05:14:43 AM Link | Quote
My final fantasy 4 DS save got corrupted. How do I repair it?

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Posted on 07-25-08 05:20:31 AM Link | Quote
How did it get corrupted? What happened just before?

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[Posted by NightKev]
Dwedit
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Posted on 07-25-08 06:08:12 AM Link | Quote
Used the M3's soft reset feature, and the ROM and Savegame both had parts overwritten with junk. First 0x1400 bytes of the savegame got killed. I had another save slot from 4 hours before it though.
Obviously, you can't just make a new savegame and copy everything past the 0x1400 byte mark, it doesn't work that way thanks to checksums.

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Posted on 07-25-08 06:10:47 AM Link | Quote
This is one of the reasons why I don't use the soft reset. Had this happen with Zelda Phantom Hourglass.

Unless you can figure out how to alter the checksum, I have no idea where to go with this.

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Posted on 07-25-08 06:19:23 AM Link | Quote
Doesn't the DS have its own built-in soft-reset? Guess you'll have to use it next time. :\

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[Posted by NightKev]
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Posted on 07-25-08 06:58:32 AM Link | Quote
Originally posted by NightKev
Doesn't the DS have its own built-in soft-reset? Guess you'll have to use it next time. :\

No no, this soft reset reverts back to the flash carts menu.

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Posted on 07-25-08 06:59:30 AM Link | Quote
Originally posted by Paula
Originally posted by NightKev
Doesn't the DS have its own built-in soft-reset? Guess you'll have to use it next time. :\

No no, this soft reset reverts back to the flash carts menu.
Oh, I see. Then he'll just have to power off/on I guess; it's only an extra few seconds.

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[Posted by NightKev]
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Posted on 07-27-08 02:55:15 AM Link | Quote
Originally posted by Dwedit
Obviously, you can't just make a new savegame and copy everything past the 0x1400 byte mark, it doesn't work that way thanks to checksums.

Unless you can figure out how to reverse engineer the checksum, you're pretty much boned.

My suggestion would just be to load the save you have that does work, change something minor, and look for things changing that you cannot immediately attribute to something (e.g., timer).

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Stevoisiak
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Posted on 07-27-08 03:24:18 PM Link | Quote
I say just use codes to get back to where you were.
MathOnNapkins
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Posted on 08-06-08 06:42:13 PM Link | Quote
I can't imagine a checksum used for a video game save is going to be that difficult to crack. Zero Mission's was just a simple 16-bit sum.
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Jul - General Game/ROM Hacking - Repairing a corrupt FF4DS save? New poll - New thread - New reply


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