Fritzbox 7590 doesn't work after cutting it off from electricity

Hey guys,

I wanted to reset my Fritzbox by cutting it off from electricity (which shouldn't be a huge problem). Since then, when reconnecting it to its power supply the Power/DSL LED is blinking very shortly with short breaks between the blinks. Nothing else works - no WLAN, nothing.

The AVM recovery tool didnt work aswell. It didnt find my Fritzbox. Anyone knows whats going on? I cant reset it as I dont have access to it anymore. Should I just keep it on power?