ROM Hack Discussion Transfering Dragon Quest XI S PC save to Switch?

[ashtonmachchine]

Hi Peeps! Any know if there is a way to make this possible?

 

[Asia81]

I was going to ask the same.
I would like playing in 4k 60fps on PC, then transfer the save to the switch to play the extra-content.
I didn't try and search to do it yet, but I hope it's possible.

 

[codychaosx]

I'm really interested in this as well. I stopped playing on PC a ways back, but I would like to finish on my switch if it's possible

 

[juins]

bump, any new findings?

 

[unknowndatax]

It's possible to transfer saves, but the PC version and Switch version does its encryption/decryption a little differently with the keys also being different.

 

[rocky_2016]

could this is possible? it's like 2 different games, not just a port because i see the director told that their team rebuild it completely so it can be called as a remake

 

[unknowndatax]

could this is possible? it's like 2 different games, not just a port because i see the director told that their team rebuild it completely so it can be called as a remake

If you want to check out the differences, I've attached my encryption/decryption tool. I've also attached the source code. This tool does not fix the checksum on the save, but when I have more time, I can update it.

Edit 1 (10-29-19):
I've updated the tool to get the checksum. You still have to fix it yourself.

Switch checksum location:
File Size - 0x0c

PC checksum location:
0x04

 

[xtremegamer]

If you want to check out the differences, I've attached my encryption/decryption tool. I've also attached the source code. This tool does not fix the checksum on the save, but when I have more time, I can update it.

Edit 1 (10-29-19):
I've updated the tool to get the checksum. You still have to fix it yourself.

Switch checksum location:
File Size - 0x0c

PC checksum location:
0x04

How do we fix it ourselves? I'm a little lost, sorry

 

[unknowndatax]

How do we fix it ourselves? I'm a little lost, sorry

Make sure to pick the correct platform for your save or it will not work since the keys are different.

1) Decrypt the save
2) Click "Get Checksum" and choose the decrypted save
3) A message box will pop up with the checksum, write it down.
4) In a hex editor replace what you were given, in the message box, and replace it at the address provided. (PC = 0x04, Switch = File size - 0xc)
5) Encrypt the save

 

[olembet]

no, switch is superior version! so, no

 

[juins]

has @unknowndatax method worked for anyone? each time i attempt this all i get is no savefiles in the game on switch, as if its the first time game is loaded

can anyone provide clearer instructions please, im a bit confused

 

[Blue]

has @unknowndatax method worked for anyone? each time i attempt this all i get is no savefiles in the game on switch, as if its the first time game is loaded

can anyone provide clearer instructions please, im a bit confused

it doesn't look like it's a working tool to convert saves, just an encryption/decryption tool.

 

[juins]

it doesn't look like it's a working tool to convert saves, just an encryption/decryption tool.

so.. just to confirm 100%
this doesnt actually convert saves at all? I thought it found the checksum so you could convert manually

 

[unknowndatax]

so.. just to confirm 100%
this doesnt actually convert saves at all? I thought it found the checksum so you could convert manually

The program will just Encrypt, Decrypt, and show the checksum of the save. You will have to manually convert the save to your desired platform. I was just only interested in the protection of the save and released a program so someone else interested in making an editor and/or converter can.

 

[juins]

The program will just Encrypt, Decrypt, and show the checksum of the save. You will have to manually convert the save to your desired platform. I was just only interested in the protection of the save and released a program so someone else interested in making an editor and/or converter can.

ah i see. ty for the clarification

 

[ctn]

Doing it manually got a little tedious, so I made a change to the app from @unknowndatax to save the checksum before encryption.

 

[PeregrineX]

Make sure to pick the correct platform for your save or it will not work since the keys are different.

1) Decrypt the save
2) Click "Get Checksum" and choose the decrypted save
3) A message box will pop up with the checksum, write it down.
4) In a hex editor replace what you were given, in the message box, and replace it at the address provided. (PC = 0x04, Switch = File size - 0xc)
5) Encrypt the save

Hi, sorry to reply so much later. Just to confirm, if I follow these 5 steps above, does the save get converted? Ie. If I chance from 0x04 to 0xc will my save file become a switch save file?

 

[MegaMagikarp]

If you want to check out the differences, I've attached my encryption/decryption tool. I've also attached the source code. This tool does not fix the checksum on the save, but when I have more time, I can update it.

Edit 1 (10-29-19):
I've updated the tool to get the checksum. You still have to fix it yourself.

Switch checksum location:
File Size - 0x0c

PC checksum location:
0x04

Wow, you wrote that all yourself?
The crypto is actually just AES...

 

[unknowndatax]

Wow, you wrote that all yourself?
The crypto is actually just AES...

At the time, IDA was acting up so I couldn't turn the ASM to C.I decided to translate it to C++ to improve my ASM translation skills. It was only when I finished the program and tried to optimize it a few weeks later did I realize it was AES-256 ECB 0 IV.

 

[ashtonmachchine]

Has anyone successfully converted their PC save file to the switch with this method?