1) Are you using emunand or sysnand? If sysnand just copy all files from old sd card to new one. If emunand you need to transfer it but I don't know how so I can't help you.
2)The guide had you setup Hourglass9 in a payload. Holding start while turning on the 3ds will boot it and you can flash a nand backup to unbrick.
1)I've deleted my emunand after copying it to sysnand, so as of now I'm only using cfw sysnand.
2)Yes, I know, but my question is which nand backup file should I use, the original sysnand or emunand since I've copied my emunand to sysnand, or it doesn't make difference?