Stuck at 'choose startup disk' after downloading Big Sur

I've just downloaded the Big Sur on my MacBook air. After it was completed I got shown an error mistake: 'An error occurred preparing the software update'.

Then I'm supposed to choose a disk, but no disks are appearing.

MacBook Air 13″, macOS 10.15

Posted on Jan 23, 2021 2:32 PM

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2 replies

leroydouglas

Level 10

206,882 points

Jan 23, 2021 3:29 PM in response to liammelkersson

liammelkersson wrote:

I've just downloaded the Big Sur on my MacBook air. After it was completed I got shown an error mistake: 'An error occurred preparing the software update'.

Then I'm supposed to choose a disk, but no disks are appearing.

—Reboot and try again

—Hold the Option key on reboot

How to reinstall macOS from macOS Recovery - https://support.apple.com/en-us/HT204904

Feb 13, 2021 8:52 AM in response to leroydouglas

Hi, we’ve just had the same problem / and now the problem is just not being resolved ???

what did you do in the end ??

We also got “ -200 3F “ appearing on the screen.

Please HELP !!! 😳

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Stuck at 'choose startup disk' after downloading Big Sur