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Click to completely wipe the drive. Close Disk Utility when finished. Phase 3: Deploy macOS Catalina Select Install macOS from the main Utilities window menu. Click Continue and accept the software license agreements.

Select your newly formatted as the destination drive. Click Install to begin the process.

: Run the following command in Terminal (replace MyVolume with your USB drive's name): sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

A standard upgrade preserves old logs, corrupted preferences, and hidden launch daemons. A from a fresh DMG: Click to completely wipe the drive

With your backup secured and your bootable USB prepared, you can proceed with formatting and installing the fresh operating system. 1. Boot from the USB Installer Drive Completely shut down your target Mac. Plug the bootable USB installer drive into a USB port.

Click the dropdown menu in the upper left corner and choose Show All Devices .

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Click Continue and accept the software license agreements

Select using your arrow keys and press Enter. Phase 2: Wipe the Target Hard Drive Select Disk Utility from the macOS Utilities menu window.

Release the key when you see the Startup Manager screen showing available boot drives.

A DMG file is a disk image file used by macOS to distribute software, including operating systems. In this case, the macOS 10.15 Catalina DMG file contains the installation files for the operating system. : Run the following command in Terminal (replace

If you absolutely need a (not just the installer app), the only trusted source is Mr. Macintosh . He hosts clean, verified DMGs from Apple's own servers.

For security reasons, it is highly recommended to download macOS directly from Apple. Via App Store (Preferred): Open this link on your Mac to open the macOS Catalina page on the Mac App Store . Click "Get" to download the installer to your /Applications Via Software Update:

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/FormatUSB Use code with caution.