You can use any amount of gb for fat32. You just need to use a program like guiformat or minitool to format it that way.
Then you google kosmos nx and download the latest one. Along with the sig patches. Copy bothe extracted files to the SDCard.
Then you use a jig or paper clip or whatever and go into rcm mode.
Then boot is late from the pc or phone and go into tools and turn on autorcm.
Now make an emmunand, boot into cfw, whatever you want to do.
That's a good "guide" but you missed A LOT of important steps!