How can I revert back to IOS 4.5.5 from 5.1.1 on my 3GS?

When using the Network this either wifi or other, the phone blanks out with a black srceen with an apple icon. I have to plug it in and let it set for a while for the mail screen to come back on. This has happened ever since I updated to IOS 5.1.1. I need to revert back to IOS 4.3.5. I need to know how to accomplish this.

There is no supported method of reverting to a previous version of iOS.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order until the issue is resolved.

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