I honestly have no clue then, as that code works just fine with consoles with different NAND sizes...@MelonGx, I discussed with mid-kid, and we can try something: Setting the EmuNAND up as a RedNAND. Would your tester be willing to try this? If he is, I'll add that option to EmuNAND9 and give you a test build.
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EmuNAND9 does it exactly like that now, but the problem with these special 2DS consoles seems different.