Stuck in reboot-loop no way out? Wipe and restore backup does not work

Hi guys,
I really appreciate you help. I had a Cyanogenmod version on my Aquaris M5 and everything was running smooth. Update was available, Update was downloaded and installed....bähm bootloop.
I have no fastboot access, but adb is possible and I end up in TWRP everytime.

Stuff I tried:
Wipe /data
Wipe /cache
Wipe dalvik-cache

Installing the working custom Rom does not help.
Installing the original Rom does not work; Error: Could not find "meta-inf"/com/google/andrid/upadte-binary in the zip file

Something I noticed. When I switch it off and switch it on again, it stops a the logo.

Any idea how to unbrick my phone? Than you very much guys

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