I flashed my N900 with some latest OS from maemo.org. It was good. Then I have install some soft for camera and I lost all sources (503 service unavailable via wifi or umts). I reflashed with default firmware and problem still exists. I cannot find here any similar thread with solution. How to step by step clean all firmware (I have read that sometimes re flashing with first versions of firmware than updating is more sufficient for battery life). I'm completely green.