
You can read more details about this problem on the Mr.

If FileVault wasn’t enabled on your Mac, you can try to delete some files using the Terminal app in macOS Recovery, which will allow macOS to complete the update process successfully.Īpple hasn’t commented on this bug so far, but hopefully it will be fixed with the final release of macOS Big Sur 11.3. You can find more on Big Sur system requirements here. If you use an older version, your Mac might misbehave during the installation process. For macOS 11 Big Sur, it’s macOS 10.10 or later.
MAC OS UPGRADE TO BIG SUR HOW TO
MacBook Pro Find out how to identify your MacBook Pro. If upgrading from an earlier release, macOS Big Sur requires up to 44.5 GB of available storage. With FileVault enabled, you have to connect your Mac to another Mac via Target Disk Mode in order to recover your files. Another thing to consider is the minimum macOS requirement a macOS version that your Mac should be running before switching. If you're upgrading from macOS Sierra or later, macOS Big Sur will require 35.5 GB of available storage to upgrade. However, recovering data without a backup can be very difficult. If you have a backup of your data, you can simply erase the entire disk and reinstall macOS. At the same time, this doesn’t affect OTA updates from one Big Sur installation to another (such as updating from macOS 11.1 to macOS 11.2). Macintosh was able to confirm that this bug affects macOS Big Sur 11.2 installer and even macOS Big Sur 11.3 beta installer. IMO, upgrading to High Sierra first, would be safer. The update process seems to run perfectly, but users get the following message near the end of the installation:Īn error occurred preparing the software update.įrom that point on, the Mac will no longer boot. The jump to Catalina was to far, yet the current macOS Catalina - Technical Specifications state upgrading is possible from 'OS X 10.9 or later'.

MAC OS UPGRADE TO BIG SUR INSTALL
Unfortunately, even if your Mac does not have 35.5 GB of storage available, macOS will try to install the Big Sur update, and that’s when users may lose all their data. As the system initiates the update process, the Mac becomes unresponsive, and data can be permanently corrupted.Īpple says upgrading to macOS Big Sur for the first time requires at least 35.5 GB of available storage - and this doesn’t include the 13 GB macOS Big Sur installer. Macintosh found out that the macOS Big Sur installer isn’t checking whether the Mac’s internal storage has enough free space. Macintosh, Big Sur still has a serious issue that can result in data loss when users try to upgrade a Mac to the latest version of the operating system without enough space available.Īfter noticing several reports from users on the web, Mr. MacOS Big Sur was officially released for all users in November last year, and since then Apple has released updates with bug fixes and overall improvements.
