ROM Hack Possible to Hex Edit 3DS Save Files?

[19cookies]

I apologize if this question has been answered before!

Is it possible to hex edit 3ds save files?
I've been waiting ages for Powersaves to put up codes for Harvest Moon Lost Valley and it just isn't happening.

It's a great game but I get so bored trying to save up money for all the upgrades and just want a quick way of being able to afford them. Is this possible?

 

[storm75x]

Save files are encrypted. Using MT Card cheat should be way easier.

 

[19cookies]

Save files are encrypted. Using MT Card cheat should be way easier.

Can I not just decrypt the save file using savedatafiler?

I presume I can't use MT Card cheats with a Gateway?

 

[hippy dave]

Yeah once you've extracted with sdf you can edit what you want. Just need to find the relevant data and look out for any checksums etc.

 

[19cookies]

Yeah once you've extracted with sdf you can edit what you want. Just need to find the relevant data and look out for any checksums etc.

Thanks! Just wanted to make sure it was possible before trying, I've done hex editing before but it was ages ago, not sure if I can remember how

Edit: sdf doesn't seem to have the save file listed so I'm not sure how to decrypt it :S

 

[Lord M]

SavedataFiler work only on Card2 game or installed games (CIA, eShop...)
or maybe you can try this tutorial for card1 game, but for what i understand, you anyway need both copy of game (.3ds and installed):
https://gbatemp.net/threads/tutoria...v-to-eshop-3ds-3dz-with-savedatafiler.380246/

 

[19cookies]

SavedataFiler work only on Card2 game or installed games (CIA, eShop...)
or maybe you can try this tutorial for card1 game, but for what i understand, you anyway need both copy of game (.3ds and installed):
https://gbatemp.net/threads/tutoria...v-to-eshop-3ds-3dz-with-savedatafiler.380246/

Thank you so much! I will try installing it and if that doesn't work I'll give that tutorial a go

 

[Lord M]

Give thanks for who make this tutorial, not to me

 

[19cookies]

Give thanks for who make this tutorial, not to me

Of course I'll thank them, but I wouldn't have found it without you!

 

[19cookies]

SavedataFiler work only on Card2 game or installed games (CIA, eShop...)
or maybe you can try this tutorial for card1 game, but for what i understand, you anyway need both copy of game (.3ds and installed):
https://gbatemp.net/threads/tutoria...v-to-eshop-3ds-3dz-with-savedatafiler.380246/

It worked!!! Thanks so much for linking me the tutorial

 

[MichiS97]

You need to be careful though. Most save games have checksum integrity checks so editing values without fixing the checksum will end you up with a corrupt save file. Pulling this off is not that difficult though

 

[19cookies]

You need to be careful though. Most save games have checksum integrity checks so editing values without fixing the checksum will end you up with a corrupt save file. Pulling this off is not that difficult though

Thanks for letting me know! Not had any problems so far but I know for the future

 

[hawkeye91]

Thanks for letting me know! Not had any problems so far but I know for the future

Wow what game is that? Do you know any game that doesnt use checksum other than bravely default? I always failed editing games like rune factory, persona q and EOIV

 

[ChrisX930]

Wow what game is that? Do you know any game that doesnt use checksum other than bravely default? I always failed editing games like rune factory, persona q and EOIV

same problem here.
Found some variables for Rune Factory 4 in the savefiles, but after editing and reimporting with Savedatafiler, the Savegame is corrupted.

 

[Rurounik99]

MH4U does have extra encryption added by Capcom.

 

[ultrazonn]

And so, how we can decrypt an hex edit correctly MH4U?

 

[Rurounik99]

And so, how we can decrypt an hex edit correctly MH4U?

According to some users, we need to find the encrypt/filter subroutine in exefs. We could try to make a editor based on mh4g exefs, or completely rewrite encryptor / filter to bypass capcom's copyright.