Homebrew Extracting the CTRNAND from a NAND backup with essential.exefs?

lAkdaOpeKA

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I've got a NAND backup from an old N3DS, and I need to extract the CTRNAND partition as a single BIN file. I have the essentials.exefs from the same console, which iirc contains the unique keys too, which means it should be doable, however, looking online, I couldn't find the right tools/combination of tools to do it.
 

lAkdaOpeKA

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Ok I got it, thank you! I don't know if there was a better method, but to get the OTP.bin from the essential.exefs, I used an hex editor and extracted the block from C00 to CFF, and made a new file with only that
 

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