NEOG was a neogamma channel, which you can't use until you fix your menu. Load that disc from RM via savemiifrii or from hbc via neogamma. Neogamma is installed to your sd card, sd:\apps\neogamma\boot.dol , just search for the files.
If that disc crashes when you try the format, your going to need to format your nand to fix. It is very likely to crash.
Nand format-
Load bootmii
Make a new nand backup
Copy nand backup to your pc
Load
ohneswanzenegger
Load your nand.bin, format it
Then install sm 4.1u
Then copy the nand.bin back to your sd card
Load bootmii again, restore the new nand.
Before you do any of this you may want to backup your savegames with savegame manager, loaded from HBC. You will loss them with this process, both of them.