ios5 beta 7 - the software on the iPhone has expired and must be updated to a new ver

[macachia]

Have a weird problem with my iPhone 4 running ios5 beta 7. All of a sudden I got Restore Completed ad hence needs reactivation which gives: ''The software on the iPhone has expired and must be updated to a new version''

Any idea please?

Cheers!

 

[Saileshbreaker]

Tried changing your date/time? Beta 7 will expire on october 20