![]() ![]() Read more: macOS 11.0 Big Sur problems and solutions.Read more: macOS 11.0 Big Sur manuals for beginners and users.Read more: macOS Big Sur - These Mac models are compatible (detailed list).This time with success, because the bar ran through completely and the Big Sur installer appeared. When I brought the Mac out of hibernation the next morning, Catalina's login screen was visible and a click on the refresh button started the download of macOS Big Sur again. This installed macOS Catalina again over my existing Catalina, which took almost 1,5 hours. In its menu you will find the item "Reinstall macOS", which I have chosen. Ultimately, the following procedure brought improvement: I called the recovery mode with the key combination CMD + R when booting. Solution: Time and money installing macOS Catalina This solves one or the other error - as well as this update error. If you reinstall macOS over an existing installation, no data will be lost, but the system files will be repaired or replaced. I suspect because Big Sur is not yet known as a recovery system on my Mac. ![]() In my case, that would theoretically have been macOS Big Sur, but unfortunately the recovery only suggested Catalina to me. Īnother idea was to cheat the Mac with the key combination CMD + ALT + R at system start, because this will install the latest macOS on the Mac that is still running on the device. Key combination CMD + ALT + R when booting? Didn't help either. ![]()
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