There's your answer. Just keep using the latest public Xcode release to submit / update your apps and use Xcode 5 to test with the beta.in the ios dev center:
Xcode 5 Developer Preview cannot be used to submit apps to the iOS or Mac App Store. Continue to use the publicly released version of Xcode to compile and submit apps to the App Stores.
You just have to download the latest iOS .ipsw then shift + restore to it in iTunes.any ways i can downgrade to ios 6 true? because i saw this in dev center
Devices updated to iOS beta can not be restored to earlier versions of iOS. Registered development devices will be able to upgrade to future beta releases and the final iOS software.