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?
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