When i bought my Lumia 520 it was been windows 8 os, but presently it is in 8.1 cyan os. if i reset my mobile in which os version it will be after resetting?
"After you update your phone to a preview version of the operating system, you can’t go back to a previous released version of the operating system. When the new operating system is released to the public, you’ll get the update on your phone, but there’s no going back before then."
So I guess there's no turning back. So in conclusion, you can reset your phone and not downgrade OS.