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BigSur macOSinstall update not showing in boot loader


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I want to update Big Sur to 11.6. In the software update I get the update, it downloads and runs. The computer restarts, but I don't see any mac OS installer in the Open Core Boot Picker. I only get my Big Sur HD, my Backup HD as well as the Windows HD, two Efi folders and two restore options. Then when I select my Big Sur HD I get back to 11.4 with the option to update and this repeats. I have had this problem for a while, I always have to create an updated USB boot stick and then reinstall the OS. It's not so bad as I can restore all the data, but it's not really a good solution. Does anyone have an idea what this could be?

Translated with www.DeepL.com/Translator (free version). Help very much appreciated.


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