startup disk

I am trying to update my computer to Big Sur. However, a tab pops up saying that choose startup disc and it wants me to select the system I want to use to start up my computer. The problem is that it seems like there is no startup disc for me to choose. I restarted several times but the result is the same. Please help me. Thank you in advance.

Posted on Feb 3, 2021 1:59 AM

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startup disk

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