How to downgrade iphone 4 from 4.3 to 4.0.1?

Firstly, if u want to downgrade, you need to have the shsh blobs for the iOS you want to downgrade to. In your case 4.0.1, this could be saved in the program files on your computers hard drive under iTunes go in there and search for the one you need. If u can't find it then try finding a website that let you Dow lad ios's. Once that is done go into iTunes and press control shift and click update and then locate the file and it will downgrade
Thanks
 
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