{SOLVED} - Z77X-UD5H - Big Sur - OpenCore 0.6.3

I did an update from Catalina to Big Sur using Clover 5126 which worked without any problem, except the App Store. For this reason, I tried to move from Clover 5126 to OpenCore 0.6.3 which failed, I got a Reboot Loop.

In the OpenCore Boot Menu I had only two options:

1) Install MacOS
2) Recovery

My Boot Partition "MacintoshHD" never showed up. If I tried "Install MacOS", it always ended up in the mentioned error below.

A fresh Big Sur Install using...

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Author: madman1234