Fairphone Open 17.06.4 (Android 6.0) release

[freibadschwimmer]

@necrosis

But how could the hardware fail if every worked fine?

Because electronics occasionally fail.
About bottom module, see for example here:

FP2 Won't turn on or charge - See first post for troubleshooting

Troubleshooting Guide: If your phone doesn’t show any signs of live (screen stays black, no vibration and no LED e.g. when trying to charge or to reboot) the most common problems are: Your battery is deep-discharged Your cable/charger is not fully compatible or broken Your battery doesn’t sit tightly in the phone The bottom module is defective (check other causes first, consider cleaning the module contacts using a dry cloth if you can, then contact support if the problem persists) Take out t…

@necrosis

I have no money actually for spare parts.

You shouldn’t need any. If you didn’t do anything wrong it should be covered by warranty.

@necrosis

Now I try to charge my phone for one day.

Make sure your charger has at least 1A output (which is minimum recommendation by Fairphone any way). A weaker charger may not deliver enough power to overcome a deep discharged battery.