I'm really not competent since I never looked into details how Harmattan works, but I'd suspect your only option _is_ reflashing. You should try to find the same version/revision-number of flash image as you got on your N950, so you don't 'upgrade', since Harmattan blocks downgrade. This means you can't flash an older than recently flashed image, and when you flash a newer image, you're one step closer to "dead end", Maybe http://maemo.cloud-7.de/950/myimages/ helps with that (OCF = One Click Flasher).