iH8sn0w has posted through his twitter a tip to extend the expiration of the beta version of Firmware 4.0.
Must be tested by people using this version ! But….

• You must be jailbroken ou you need to unzip Firmware 4.0
• In the file lockdownd., just change 0×4C059F00 (June 1, 2010) to 0xFFFFFFFF (February 07, 2106)