Can i downgrade my phone from 4.3.3 as it is now not working all apps crash ipod wont even open so any tips please

4.3.3 problems

First tip, you can't downgrade you iOS.
Now, to address your issues.  Connect the iPhone to your computer and tell iTunes to "Restore" it.  When asked, tell iTunes to setup as a new device.  Select your applications, music, etc. and sync those onto the phone.
Now, it it possible that you have just done something sly like disconnecting it from iTunes before the snc was complete, so you might just havea few corrupted files on the device.  For the problem with your apps crashing, try to open the app store application (on your iPhone) and select to downlad & install a simple free app.  That might resolve your issue with apps crashing.

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