So, I've done everything from Plailects' guide until Section IV - Copying RedNAND data to SysNAND.
And now my 3DS is loading the Hourglass9 when press START right after boot and the Decrypt9WIP when I press X after booting.
Now here comes the tricky part:
I have a 2GB SD that came with my 3DS...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced