No! Do not install a NAND backup from another 3DS!
That will brick your 3DS!
I'm not sure if restoring a NAND backup from another 3DS would cause a hard or softbrick, although I'm pretty sure it would cause a hardbrick.
You can fix a soft brick by updating your 3DS through recovery mode.
You can fix a soft brick by getting a hardmod (and a proper NAND backup. If you do not have a proper NAND backup, your 3DS would be permanently bricked.)
I'll make sure not to restore from that NAND then, is there any way to retrieve data such as friend codes/etc from that backup and get my NNID unlinked without having to contact Nintendo?
afaik, no.
You'd need to have access to your original 3DS to be able to transfer your data.
Just contact Nintendo, that's the only way to transfer your NNID.
Restoring a sysnand backup is a hard brick. Emunand obviously not, since you can just not boot to emunand until you fix it.
The encryption on the nand is unique to each 3ds so the new 3ds can't see anything from the old nand.
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