well if you know of to use a computer is very easy. Just use gparted, create all the partitions for the android system, reflag the boot sectors. You can use the atmosphere space, split it and use that space to make the android partitions.
Actually, you will not be able to do anything. You can't. I can smell your fear.
Can't find any threads about this particular issue on GBAtemp or the wider intarwebz. Saw one video on YouTube that seemed relevant, but it was some dude with the same issue, no solutions offered in the comments. :/