Automatic return to Boot menu

I wanted to upgrade my hack from Clover to OpenCore. Thus, I have created a USB stick incl. Big Sur Installer.

With this I can install a fresh copy of Big Sur and also boot without any problems. Also I can boot old recovery-partions via USB-stick. All good.

BUT: I cannot boot my existing installation. It is listed in the boot menu. When I select it, the screen goes black briefly and it goes back to the menu. There is no log or display of any kind here.

Anyone have a tip?

submitted by /u/saibotG
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