In Minecraft Xbox edition there is a setting that resets the nether. Does it just reset the nether? And does it affect the upper world?
When you reset the nether world on the Xbox edition your seed gets reset, the map vanquished, your buildings forever gone.
More importantly, It also updates new and important things, for example a nether fortress with a blaze spawner. (now you can farm blaze rods!)
Well, to all the those Minecraft PC gamers asking: What do you mean update new and important things? Well here's your answer:
The Nether is approximately 280x280 on the Xbox version (not theoretically infinite like the PC version!). So you may not get a nether fortress in the whole map? What can you do? Reset the nether!
Then you can get these materials(e.g. blaze rods) on your original over-world world and do whatever you wish!
For clarification, only your nether seed gets reset when you reset the nether. Your over- world world is completely untouched.