Hey there, i am replying to myself now
After using ssh to edit the config.txt file and enabling hdmi_Safe=1
I can get into ES. The problem now is, that the resolution and overscan is completely messed up.
How do i change the value of safe mode?
I feel, i am so close to it.
Does anybody know, what the changes between 7 and 7.1.1 are and why normal hdmi mode is not working anymore ?