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upgrade to big sur

Tried the new OS 12.0 and it caused me nothing but headaches from Bluetooth being set off after restart and the Thunderbolt 3 external drives magically not being acknowledge there. Wondering where I can get Big Sur since that OS did not give me these wonderful problems.


iMac, OS X 10.11

Posted on Dec 13, 2021 2:27 PM

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Posted on Dec 14, 2021 11:02 AM

Surprise surprise 12.1 actually resolved my initial glitches! External drives are showing up and bluetooth is fully engaged after restarts. Thanks for the advice, it helped keep my sane through this ordeal.

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10 replies

Dec 14, 2021 8:58 AM in response to Sinclair 2005

Use the link I provided to download Big Sur and create the Bootable USB.


Copy and paste the following link into Safari: link-> macappstore://apps.apple.com/us/app/macos-big-sur/id1526878132?mt=12 <-Link

You will need to create a bootable USB installer, and wipe your Mac to install Big Sur. It cannot be installed on top of Monterey directly.

Link->How to create a bootable installer for macOS - Apple Support


Dec 13, 2021 6:18 PM in response to Phil0124

How about Mojave 10.14.6? I already did a factory re-install to that today. I am hoping to only upgrade to Big Sur since that version did not lose my external drives and keep turning the Bluetooth off after restarting the computer every time? Big Sur (provided I can get it) won't necessarily need to wipe out Mojave, should be just a normal upgrade as before?

Dec 14, 2021 12:44 AM in response to Sinclair 2005

To get Big Sur try first entering this command in Terminal to find what macOS versions are available:

softwareupdate --list-full-installers


I got this a couple of days ago:

Title: macOS Monterey, Version: 12.0.1, Size: 12128428704K, Build: 21A559

* Title: macOS Big Sur, Version: 11.6.1, Size: 12428472512K, Build: 20G224

* Title: macOS Big Sur, Version: 11.6, Size: 12428553042K, Build: 20G165

* Title: macOS Big Sur, Version: 11.5.2, Size: 12440916552K, Build: 20G95

* Title: macOS Catalina, Version: 10.15.7, Size: 8248985973K, Build: 19H15

* Title: macOS Catalina, Version: 10.15.7, Size: 8248854894K, Build: 19H2

* Title: macOS Catalina, Version: 10.15.6, Size: 8248781171K, Build: 19G2021

* Title: macOS Mojave, Version: 10.14.6, Size: 6038419486K, Build: 18G103

* Title: macOS High Sierra, Version: 10.13.6, Size: 5221689433K, Build: 17G66


Then enter the command softwareupdate --fetch-full-installer --full-installer-version xx.x.x

where xx.x.x is the version number in the list you wanted

upgrade to big sur

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