tried to download i0s5 on my iphone now it won't work at all says phone is not registered to iphone developer what do i do it won't restore or sync either

Just download latest correct soft and try to restore using Option + restore button. Ive manage to restore after 4th or 5th try

Yes, that's correct. Unless you are a registered developer there is no reason for you to be installing beta software.

There may honestly be nothing that can be done to rectify this issue until iOS 5 is officially released.

Might be a good idea for your daughter to tell her friends to keep their hands off of her personal posessions.

Unfortunately, downgrading is not supported. You may be able to find a way to back it out via Google. Personally, I'd be having a long hard talk with your daughter's friend's parents about compansating you for the loss of your phone until fall.

The only real option here would be to pay the $99 and join the iOS developer's program so you can register the device and get it working under the iOS 5 beta. That or get them to shell out for a new phone to replace yours and give them the one now running iOS 5.

Oh yeah, and ban your daughter's friend from ever entering your home again... not to mention grounding your daughter.

KiltedTim - what do u mean by - not supported ? I was able to downgrade my iPhone ... took a while but was possible

I mean that Apple does not support it. In fact, they have explicitly warned developers that if they install the iOS 5 beta, there is no way to go back to a previous version of iOS, only forward.

Yes, people have figured out how to do it. Not everyone is going to be able to do so, especially those who are not developers (iOS or otherwise) or very computer savy and willing to take some risks. It's also possible to install apps from outside the app store or get a locked phone to work on another network without an official unlock, but I doubt anyone would argue that those things are or should be "supported".

In that case - yes u absolutelly right ..as far as I remember as well they said taht u can't downgrade modem baseband, but actually - you can .. And I'm not saying about doing jailbreak or any other dodgy tricks ..

It can be reverted to original state :

1st : the phone need to be put into "recovery mode" ( the plug into itunes logo has to appear ). If such a iDevice is then connected to itunes, it will automatically say that this phone needs to be restored. ITunes must be a final version ( see in "about itunes", it MUST NOT say "iTunes 10.5 beta" but rather "iTunes 10.3.x or iTunes 10.4.x" without "beta" in name ).

Such official ( non-beta itunes ) iTunes will then download the official ( non-beta iOS) iOS for the phone ( in this case this would be 4.3.5 ) and install it back onto the phone and all is good again.

For how to put the idevice into recovery mode see this article : http://support.apple.com/kb/ht1808

THANK YOU SOOOO MUCH!!! I have had the same problem for 2 months and had no clue how to fix it. THANK YOU!!!

Never mind it didn't work.

You're probably going to have to wait for the final iOS 5 to be released.

Yeah... That is why i am now getting an iPhone 3GS from my friend.

Why was your daughter's friend messing with your iPhone?

a friend of mine jailbroke his phone and ios5 worked only in airplane mode. Once he reconnected with the network same code and he was SOL.

but none the less, yes whyis your daughters friend messing with your possessions? god knows what else they do when you are not around. Check the wine cabinets!