Restoring to 4.0.1

[Darkhrse99]

Downgrade to 4.0.1.

How?
i've done it years ago, but forgot how.

[PatrickGSR94]

Download 4.0.1 from here or other sites (over 300 MB) then point hosts file to Cydia server and shift-click restore in iTunes and choose the downloaded IPSW file.

[jkmonkey]

No need to change hosts or run umbrella. Apple is still signing 4.0.1. Just hold shift while clicking restore in iTunes and select the firmware you downloaded.