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Read on for all your problems and doubts on this...
Q : Can the timebomb be deactivated ?
A : No. That involves modifying lockdownd, which would cause it to return an invalid signature on boot and therefore brick your iDevice. Unfortunately, we don’t have an iBoot-level exploit for iOS 5 beta 1, so we can’t break the boot chain.
Q : Can I backup my iDevice after the build deactivates itself ?
A : We are not completely sure, most probably it doesn’t.
Q : Will it make a difference if I have a Wi-Fi only iDevice and just change the date and time ?
A : That won’t work.
Q : Will iTunes let me restore iOS 4.3.3 back to my iDevice, and will everything still be there ?
A : Yes! Just plug in your iDevice and click Restore. All of your data will be restored back the way you had it.
Q : Why did Apple timebombed iOS 5 ?
A : Because you’re not supposed to be using them for your personal uses. They are meant to help developers in porting their apps to iOS 5.