macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.
When installing a macOS update with a macOS installer, your Mac needs to reach the Apple server. When it says 'the recovery server could not be contacted, it means that your Mac failed to build a connection with the Apple server. This usually occurs on machines that support High Sierra (macOS 10.13) natively, but whose owners have not installed High Sierra on them previously. Installing High Sierra on these machines will update the machine's system firmware, allowing it to boot from an APFS volume. This is necessary in order to boot Catalina. Use Patched Sur to install macOS Big Sur on unsupported Macs. To get started, make sure that you have a 16GB USB drive with no important data on it. This will be used to create a bootable macOS. If you’re an advanced user who is comfortable with running unsupported system software on unsupported hardware, and you’re feeling adventurous, there are some solutions to install and run macOS Big Sur on unsupported Macs, but it’s nowhere near as straight forward or simple as installing Big Sur on an officially supported Mac is.
Check compatibility
macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you might be able to install an old version of macOS instead.
MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.
If upgrading from macOS Sierra or later, your Mac needs 35.5GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.
Download macOS Big Sur
If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu > System Preferences, then click Software Update.
Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.
Install macOS Big Sur
After downloading, the installer opens automatically. Click Continue and follow the onscreen instructions.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, it might restart and show a progress bar or blank screen several times. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Stay up to date
After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. To check for updates, choose Apple menu > System Preferences, then click Software Update.
Jul 05, 2021 • Filed to: Solve Mac Problems • Proven solutions
There are many issues that people may encounter while installing the macOS update. One of the common problems is that the recovery server could not be contacted. When trying to install macOS High Sierra, Mojave, or Catalina, there is an error message popping up: The recovery server could not be contacted.
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If your macOS update is also stopped by this error, you will find this post helpful. From this post, you will learn why the recovery server could not be contacted and how to fix it.
What Does It Mean When the Recovery Server Could Not Be Contacted?
When installing a macOS update with a macOS installer, your Mac needs to reach the Apple server. When it says 'the recovery server could not be contacted, it means that your Mac failed to build a connection with the Apple server.
There are multiple culprits behind this issue.
- Your Mac is disconnected from the network. A stable network connection is required for your Mac to successfully contact the Apple server.
- The date and time on your Mac are not properly synced with the Apple recovery server.
- The Apple server is overloaded with too many users trying to installing the new update at the same time. Whenever there is a macOS update recently released, the Apple server usually experiences a busy time.
Solution 1: Check Network Connection on Mac
Firstly, you need to check if your Mac is connected to a proper internet connection. If your Mac is on a wired internet connection, you can re-plug the Ethernet cable to check.
If your Mac is using a Wi-Fi, you can access the Wi-Fi option from the top right corner of your screen to check it is connected to a stable Wi-Fi network.
The faster the internet, the quicker you can access the Apple recovery server.
Solution 2: Sync your Mac' Date and Time to Apple Recovery Server
If your Mac's date and times are not synced to the Apple recovery server. You can update these settings by utilizing these steps;
Step 1: First of all, close the error. This will open the macOS Utilities window.
Step 2: Next, you are required to choose the option 'Utilities' on the top menu bar.
Step 3: You will see the option 'Terminal', double click on it.
Step 4: Then type the following command line: 'ntpdate -u time.apple.com' and press enter.
Step 5: The above step might take some time. Once the process is completed, you can try reinstalling the macOS update again. Hopefully, your problem will be solved.
Also if the 'ntpdate -u time.apple.com' command-line failed to fix the recovery server could not be contacted on your Mac, you can try the following command.
- Open Terminal.
- Enter date. And hit Enter key. This will show the date of your Mac.
- If the date and time are wrong, you should enter the current time with the following command line: date mmddhhssyy. For example, if it is July 20, 09:00 am, 2020, you should enter: date 0720090020 (July 20, 09:00 am, 2020,).
- After that, quit Terminal and click Reinstall macOS to run the Catalina/Mojave installer again.
Solution 3: Install the Full Version of Mojave/Catalina Installer
Some users found that when they try to install a macOS update with the update installer from App Store, it just showed the error message 'the recovery server could not be contacted. However, after downloading a full version of the macOS installer, the installer can run without any error. Here is how you can get a full version of the macOS Catalina update.
Step 1Run Terminal.
Step 2For example, to download the full version of the macOS Catalina 10.15.3 Installer Application, enter the command line as below.
- softwareupdate --fetch-full-installer --full-installer-version 10.15.3
Step 3The installer will be downloaded in the Application folder.
Step 4Run the installer to install the macOS without the recovery server error.
Solution 4: Erase Your Disk and Reinstall macOS
In case you have utilized all the above methods and have not received any good results. Only then, you can erase your hard disk and reinstall macOS. You can enter the recovery mode to erase the hard disk. After that, reinstalling macOS can solve your problem. Follow the steps properly erase your hard disk and reinstall macOS;
Step 1Firstly, you need to restart your Mac.
Step 2When the Mac is starting, you need to press and hold CDM + R keys to enter the recovery mode.
Step 3In the Recovery mode, click Disk Utility and erase the Macintosh HD volume. This will delete all your data on your Mac so make sure you have backed up your important data.
Step 4After erasing your disk, you can reinstall macOS. This time, you won't see the recovery server could not be contacted error.
If you have important data missing after the macOS update, you can get it back by using Recoverit Data Recovery software. The program is designed to recover photos, documents, videos, emails, etc. from the Mac computer after the data are deleted mistakenly or lost because of macOS reinstallation, factory reset, or virus.
Lost data can be recovered in 3 simple steps by Recoverit: select the drive of lost data, scan the drive, recover the files.
Download the free trial version of Recoverit Data Recovery to scan and find your needed files.
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Conclusion
Many users complained about the recovery server could not be contacted error. Every error is solvable, only if you apply proper solutions. And to tackle the incidents that may happen in the macOS update, you need to back up your data before implementing any of the steps. In case your data is lost, you can recover it using Recoverit Data Recovery.
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