Looks to me like you were testing any of those 'patches', that most of the more knowledgeable people around warn about since years.

If so, only a full flash of Vanilla EMMC and Combined firmware image according to this wiki article http://wiki.maemo.org/Updating_the_tablet_firmware will revert those 'patches'. Read the article carefully and use the instructions for your OS of choice. Make sure to flash Combined first, then Vanilla, then again Combined again.