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1. #DOWNGRADE MAC OS CATALINA INSTALL#
2. #DOWNGRADE MAC OS CATALINA SOFTWARE#
3. #DOWNGRADE MAC OS CATALINA PASSWORD#
4. #DOWNGRADE MAC OS CATALINA DOWNLOAD#

Now your Mac is ready to erase macOS Catalina from the disk.

You can skip this step but, considering the Mac users’ experience, the NVRAM resetting removes potential bugs, which are harmful for a new macOS installation. Immediately press and hold the Option(Alt)+Command+P+R keys until your Mac restarts.Click on the Apple menu and select Restart.After deletion, reset NVRAM by completing the next steps:

#DOWNGRADE MAC OS CATALINA SOFTWARE#

The best way to completely delete an application and all its service files from your Mac is to use the universal App Cleaner & Uninstaller software tool. Moreover, if you noticed that your Mac starts behaving strangely after launching of a particular program on macOS Catalina, you should remove this app. Some users reported that after resetting the nonvolatile random-access memory on a Mac and the macOS Catalina reinstallation, the 10.15 operating system runs perfectly. If one of the reasons you want to downgrade macOS Catalina is some software issue, it may be connected to the information stored in NVRAM.

#DOWNGRADE MAC OS CATALINA DOWNLOAD#

For your convenience, here are the links where you can download macOS High Sierra or macOS Mojave.

#DOWNGRADE MAC OS CATALINA INSTALL#

If you wish to install a macOS from a USB thumb drive, download the desired version of the operating system in advance.

#DOWNGRADE MAC OS CATALINA PASSWORD#

At the menu bar, click Utilities → from the drop-down menu, select Startup Security Utility → enter either the login password, Apple ID password, or a firmware password if prompted → in the External Boot section, select Allow booting from external media to enable options of the macOS installation for the next steps.ģ. When you see the utilities window, release the keys. As soon as you see the Apple logo on the screen, press and hold the Command + R keys until the computer boots into Recovery Mode. So, click on the Apple menu and select Restart. If you have the T2 chip, you need to restart your Mac into Recovery Mode to continue to downgrade macOS.To ensure that you have a T2 controller, press and hold the Option key and click on the Apple menu → from the drop-down menu, select System Information → in the sidebar, choose the Controller (or iBridge) section → if you have the chip, you will see Apple T2 chip in the Controller Information on the right.If you have one, take the following steps: This refers to the iMac Pro, and the MacBook Pro, MacBook Air, and Mac mini models released in 2018 or later. The next step is to check if your Mac has the Apple T2 Security Chip. To make a backup of the information stored on the disk, you can transfer it to an external hard drive or cloud storage like Dropbox, Google Drive, OneDrive, and so on. This is because the next steps include erasing your HD. Even more important is to save your data if you have not already made a backup before installing macOS 10.15. While using macOS Catalina, you have probably created several files, which you want to save.

The first thing you should do is to make a backup of your data. Check if your Mac has the Apple T2 Security Chipĥ. We will tell you at what step it will be necessary to connect to a hard drive with a backup or macOS installer.Ģ.

It is advisable to disconnect all additional external devices. Your computer must be connected to a power source and have a stable internet connection.