![]() ![]() Is there any way around this? It feels like the easiest way would be to create an offline installer for Big Sur but I need a way of doing it that will work on Windows or Linux, and doesn't require downloading. This feels like it's essentially bricked the macbook air by leaving it on an ancient version of OSX. If the Mac you’re upgrading to (not from) is in the right range of vintages, you can do the following: Install Mac OS X 10.11 El Capitan on an external drive. All of the unofficial ways I can see of updating the CA certificates require copying them from an updated mac. The updates just try and open the app store which fails to connect because Mountain Lion's certificate store is out of date, it doesn't trust the App Store's certificates so won't even try and connect.Īll the ways I can see of creating offline install media require a mac. ![]() The problem is that we cannot see any way of updating from Mountain Lion back to Big Sur. This of course has left it on Mountain Lion, which is what the laptop came with. We have a late 2013 macbook air that was running big sur until the person using it erased it and used the internet installer to reinstall OSX. ![]()
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