N3DS error: Unable to mount CTRNAND or load CTRNAND firm

[Released: 2011] The 3DS is similar to the DS, but is capable of projecting stereoscopic 3D effects without the use of 3D glasses or additional accessories. A redesigned "XL" version of the console was also released.

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GBAtemp
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N3DS error: Unable to mount CTRNAND or load CTRNAND firm

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Hi, the other day I was playing on Twilightmenu++, and I exited to the home menu. When I did that an error appeared: "An exception ocurred. Data abort. Processor: ARM9". I decided to reflash a SysNAND backup I had using gm9. And now every time I try to boot the 3ds up I get the error: "Unable to mount CTRNAND or load CTRNAND firm. Please use external one. Press any button to shutdown". And when I try to boot up the console without the SD card the blue led light turns on, then dissapears. I...

N3DS error: Unable to mount CTRNAND or load CTRNAND firm

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