I've been using a Nokia N900 and, after a software update, the device reboots and shows a page with OVI shop terms and conditions, including the spam sending.

I don't accept this contract, but this page doesn't give any way to "Decline", "Skip" or opening any menu or function.
It only shows this page (that says continuing means acceptance), and 2 buttons: details of T&C, and "Ready".

What can I do?
Nokia's Maemo is preventing me to use my phone.