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Nintendo DS
Backup a GBA Pokemon bootleg save file
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<blockquote data-quote="Arekkuwu" data-source="post: 8911919" data-attributes="member: 515120"><p>So after some research I found out this:</p><p>The best way I found to locate the save file in the rom is to search 4 specific bytes.</p><p></p><p>The first byte will be located at the adress: 0x****18</p><p>So we need to find the unknown *.</p><p></p><p>For that the software start searching at the last adress of the rom plus 0x18. Then it checks if the 4 next bytes are the one needed: 0x25 0x20 0x01 0x08.</p><p>If they not match it decreases by 0x20 the next first byte's adress to test.</p><p>When the last adress of the save file is located. It extracts the save file depending on the number of byte of the save file of the game.</p><p></p><p>It's also important to add stuffing bytes to respect the save file format and length.</p><p>It works without stuffing bytes in a save editor but emulator may tell the save is corrupted or give a black screen.</p><p></p><p>This is what I found for bootlegs I know. It mays be diffrents in others.</p><p></p><p>If someone wants to try it feel free to give me feedbacks.</p></blockquote><p></p>
[QUOTE="Arekkuwu, post: 8911919, member: 515120"] So after some research I found out this: The best way I found to locate the save file in the rom is to search 4 specific bytes. The first byte will be located at the adress: 0x****18 So we need to find the unknown *. For that the software start searching at the last adress of the rom plus 0x18. Then it checks if the 4 next bytes are the one needed: 0x25 0x20 0x01 0x08. If they not match it decreases by 0x20 the next first byte's adress to test. When the last adress of the save file is located. It extracts the save file depending on the number of byte of the save file of the game. It's also important to add stuffing bytes to respect the save file format and length. It works without stuffing bytes in a save editor but emulator may tell the save is corrupted or give a black screen. This is what I found for bootlegs I know. It mays be diffrents in others. If someone wants to try it feel free to give me feedbacks. [/QUOTE]
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