Yesterday, Nokia started the rollout of the Belle FP2 update for the last crop of Nokia OS (formerly Symbian) phones including the 603, 700, 701 and 808 PureView (with the PureView getting extra imaging and gallery features). Shortly after, though, the update was pulled from Nokia’s servers.
The reason is that while for some the update process went fine and everything worked smoothly after it, others experienced various issues ranging from unable to install the update to problems with different parts of the updated software.
Nokia is investigating the issues and will put the update back up once they’ve been resolved. You can keep an eye on the Discussions thread for updates or wait on the Software Update app to notify you of a new update.