Oh.I though someone tried this with no gain from it. It's tied to the Game ID - To the savefile. Only a new game from 0 can repair this.
Swear to Arceus if on Friday I go online and I get this error code I'll flip shit
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It's a "defense mechanism" of sortsTrying this, but it gives me "The saved game data is corrupted". Probably Secure Value.
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If it's tied to the savefile, one can change it back.
It did that for me too, but ultimately deleted the save, restored and had my old save back