- Check the #blackscreenguide
- Start without any module
- Start in #dic:safemode
- Do a #dic:factorydatareset
- Try a fresh reinstall as explained here:
Installing the Fairphone 2 from scratch in case of failure / Komplette Neuinstallation des Fairphone 2 im Fehlerfall
- Contact a #fairphoneangel that might be able to help you
- Contact FP support
Edit: Modified a sentence