During installation of a system update on my Galaxy S7, the screen started alternating between a blue screen with the android logo and a black screen with several error messages. The error messages is shown very briefly but one of them are: "fail to open recovery_cause (no such file or directory)". This went on and on and on ....
After searching a bit on internet, I tried to enter Recovery Mode (Volume Up + Home and Power). This removed the alternating screens but now the phone is totaly dead.
I've tried numerous key combinations without any responce. I've charged the phone. I have also connected the phone to my PC with an USB-cable. No response. I have removed the SIM and memory card and reinstalled them again. I am not able to get any response at all from my phone. Any suggestions?

 

I also believed there would be no more updates but a couple of days ago there was a message that a new system update were available and I could choose to install immediately, during night at 02:00 or reject (as far as I could tell, it looked just like the previous update messages I've received).

I chose to update during night at 02:00. The next morning the uppdate had not been installed so I then chose to start the update manually. After that, the problems occured as described.

 

I do not know how to perform a system recovery on a dead phone. Please explain how it can be done.