can't get what you are doing
maybe that here helps ?
run the multimodmanager make sure you only have those 4 files in the wad folder on your sd card when you want to update your cios (or included a neogama wad if you like too, one for a full or a forwarder channel).
afterwards you should be able to use neogamma and it will tell you 249rev17 in the lower right (?) corner of the screen
good luck, you will figure it out i am sure