After copying the Sierra Install App to the Application Folder I tried the following command: All I have is latest MacBook 13" with latest Catalina installed. So my next try was to create a simple bootable stick with Sierra as mentioned before. Anyway the internet-recovery was not successful. I thought it might be an error about the datetime and certificates, so I also changed the date back to somewhere in 2012. I already tried the Internet-Recovery on the iMac with the option to install macOS Lion, but this end up with an -2 million days error. To download High Sierra through the App Store is not possible, but luckily I got the Sierra dmg from here: I have a MacBook Pro 13" with the latest Catalina installed (10.15.3). All I need is just an install media for sierra or high sierra.
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