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Easiest way to go back to 4.2.8 or 4.3.3. Connect to iTunes, put iPhone into DFU mode. iTunes will recognize this and tell you it needs to restore. Since 4.2.8 or 4.3.3 is latest official it will automatically install that version for you. No need to torrent/download a ispw file at all.
 
I didn't ask for your advice nor did I ask you to post in this thread. If you have nothing useful to say then go stay out of this thread.

When you asked "where do I download the ipsw?" You were merely asking everyone for input. I gave you that information. Whether you wanted the info or not is not up to me. I gave you what you asked for. Maybe you were looking for the exact location, which by using that link you could obtain yourself.
And giving you the link where to download the ipsw file IS USEFUL.
If you ask a question but don't like the answer, then ask it a different way. You'll possibly get better and more clear answers.
 
Help me!

Hi! My name is Susy and I live in Italy. I have an Iphone 4 pre-used (from CANADA - Roger), gift of my cousin. With a gevey sim, I used this until 2 weeks ago. One morning, my boyfriend upgrade this at IOS 5 and now it's lock. I'm not a developper and I don't understand nothing about it, but I can't think that it will be lock forever. Please help me!:)
 
Hi! My name is Susy and I live in Italy. I have an Iphone 4 pre-used (from CANADA - Roger), gift of my cousin. With a gevey sim, I used this until 2 weeks ago. One morning, my boyfriend upgrade this at IOS 5 and now it's lock. I'm not a developper and I don't understand nothing about it, but I can't think that it will be lock forever. Please help me!:)

This 4 month old thread has nothing to do with your issue. A simple search of the forum would have turned up this thread...

https://forums.macrumors.com/threads/1253345/
 
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