Is it possible to run Android on iOS? Ok so I was thinking, Can you run Android on a iOS device? I did some research and Android could run on ARM (Most apps would not work) but how come no one has tried to run it. Whats holding them back?
Many reasons


You cannot create another file system
No firmware exists for this
It would void your warranty
Android device developers spend a lot of time developing their hardware and software to work together, just like iOS.
The amount of effort required (boot ROM firmware  modifications, bricked devices, etc) makes it much easier just to buy an Android if you really want one.