Do you have installed MacOS Catalina on your Mac, but you have problems with the operating system that Apple gave us in 2019? Although re-MacOS Mojave is a process that can be long and complex, with this guide we will provide you with the life.
To return to MacOS Mojave you will need to clean the main unit of your Mac and reinstall the operating system on an external drive. However, if your Mac was equipped originally with the Mojave, you can skip this process.
Step 1: make a backup of your Mac
In the first place, you need to create a backup of Time Machine to save your current files, or send them to the cloud, either Dropbox, OneDrive, iCloud, or the service you’re using. You’ve probably made a backup before you install Catalina. Otherwise, you will have to do it now before moving forward. As you indicated, to get back to Macos Mojave you will need to clean the unit of your Mac.
If you need help to make a backup of your Mac, this guide may be useful to perform the process.
Step 2: enable boot external
The second step applies applicable for models MacBook Pro, MacBook Air and Mac mini released in 2018 or later. It is also useful for the iMac Pro 2017 or later. All of these devices include the security chip T2 of Apple, that provides secure boot, encrypted storage and command “Hey Siri”, among others.
To check if your computer has this chip, you must follow this route:
Apple button > About This Mac > System Report > Controller (or iBridge)
If your Mac does not include the security chip T2 of Apple, it will not be necessary to enable a boot from external media. Otherwise, restart your Mac and hold down Command and R until the device boot into the recovery Mode.
When you’re in the recovery Mode, click on Utilities on the toolbar and in the drop-down menu, press Utility boot security. Enter the administrator credentials and subsequently mark the check box next to the option to Allow boot from external media, which is located in the Boot external.
Step 3: download MacOS Mojave
You must download MacOS Mojave from the App Store. The best way to get a copy is follow this link on a Mac computer, since it is not possible to find this operating system if you do a search in the App Store.
When you press the link, it will automatically load the download page of the Mojave in the App Store.
Step 4: prepare your disk
The next step is to format your external drive. Connect and follow the following path:
Finder > Applications > Utilities > Disk Utility
Select your drive, which should be located in External, and click on the tab Erase. Assigns a name to the unit, select the appropriate format (MacOS Extended or APFS), choose partition Map GUID, if available, and then tap Delete. Select Done when you finish the formatting.
Now the external drive will be bootable. Follow this path:
Finder > Applications > Utilities > Terminal
In Terminal you have to write the following code. Remember to replace “TuUnidadExterna” with the name you gave to this unit in the formatting process.
sudo /Applications/Install\ os\ Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/ TuUnidadExterna
Press Enter/Return after you type the command. You will need to enter the administrator password when prompted, followed by the key And to confirm.
Step 6: clean the drive of your Mac
With MacOS Mojave installed on an external drive, you’re ready to delete the drive of your Mac. Do not connect yet. Instead, restart and hold down Command and R until the device boot into the recovery Mode.
Then click on the option disk Utility followed by Continue. In the next screen, select the main drive of your Mac and click the button Delete. Follow the instructions to select a drive name, file format and partition map GUID.
Step 7: install the Mojave
If your Mac came with MacOS Mojave, restart and hold down the keys Shift, Option, Command and R simultaneously. This will automatically install the Mojave from an image located on a dedicated partition.
Otherwise, you enable the internet on your Mac, connect the external drive and restart through the icon of Apple located in the top left corner. As your Mac restarts, hold down the key Option.
The next screen will present a list of options of boot disk. Select the external drive that contains the installer for MacOS Mojave and click on Continue.
Step 8: use Time Machine
With MacOS Mojave in operation, you’ll need that Time Machine to restore your settings and files to the state prior to Catalina.
Restart the Mac and hold down the keys Command and R to enter the recovery Mode. Click on the option to Restore from Time Machine Backup, which appears in the pop-up window MacOS Utilities. Press Continue to enter this mode, followed by another button to Continue to recognize the information.
The restoration of the backup will start when you select the source where is the backup. Then, select the backup of the Mojave’s most recent to continue. If all goes well, you should have recovered the files and settings, and you’ll be able to use your computer with MacOS Mojave.
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