Homebrew Problem with Fuse3DS

[Cubbz]

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SOLVED
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Hey there.
A friend gave me a DSi to install HiyaCFW on to, but I have never done this before. I am following the dsi.cfw.guide and everything has gone well up to the point of mounting the NAND backup onto a folder.
When I try to mount the NAND backup onto the new folder in Fuse3DS, I get

NAND is too small (expected >= 0xF000000, got 0X33

I'm sorry if this is a silly mistake but I have basically no experience with DSi modding.