Persona Q US TitleID is: 0004000000123400 (Was already on my Card, so i went with US Version)
I took the Save (can store/load in .sav and eShop - press x to switch) from
SD Card:\Nintendo 3DS\ID1\ID2\extdata\00000000\00001234 and decrypted
it with SaveDataFiler (ExtData)
Highlight 00001234 and press Y to export Save to SD Card\filer\ExtData\DATE-TIME\00001234
I went back into game, changed Money Value, saved into same slot and exported it again.
(1st Money: 1000yen, 2nd Money: 1020) > Now to PC / Hex Compate work.
I loaded both Files into HxD (my prefered Hex Editor)
Save 1/2: 000S_MAP/001E_MAP/001MAP unchanged so it has to be inside 001E_GAME
1000yen > hex > 03E8 // 1020yen > hex 03FC, i compared Byte for Byte to find the Value
Found them in Offset 84DB > 1st Save E803 (reversed) / 2nd Save FC03 (reversed)
I dont know what the max money value is, so i decided to go on with 65000yen
(FDE8 > E8FD - reversing) and saved the new value inside 1st Save on SD Card.
Back in SaveDataFiler i restored the first Save by Highlighting the correct
DATE-TIME\00001234 at SD by pressing A to import it.
Now it's time to check if the game is protected or not by loading the Save.
(Dont forget to switch to loading from SD Savegame!) > Data corrupted.
The Savegames are protected, but it was easy to find :/
Investigating Savegame protection - There has to be something like CRC
inside the file.
Will update if i can find anything.