Okey, so this is kinda embarrassing. I manage to change the year on my phone to 2012, and suddenly my iPhone 4 rebooted. When it turned on again it was locked, telling me it has expired. I don't think it's a problem to restore, but the thing is that I'm not able to take backup of my phone, which is quite important.
Someone who MIGHT have a solution?
Someone who MIGHT have a solution?