I installed iOS 7 Beta 2 on my iPhone 4S a few weeks ago and am now trying to update to beta 4. 1) Do I first have to install beta 3 to get beta 4 or can I skip straight to 4? 2) At first, when I would go to "software update" in settings it would give me the error that checking for update had failed. Now it just says I have the current version of iOS 7 installed. My UDID is not registered. Would registering it allow me to do OTA updates? If it doesn't can I download beta 4 and install it through iTunes without getting the "you are not registered to use this software" error?