Install macos catalina from usb upgrade#

dmg file with the macOS installation files. Right-click the USB flash drive and select the Restore with Disk Image option from the left navigation pane.Ĭlick the Yes button to confirm the erase of the USB flash drive data. If this is the case, the chances are it’s using an MBR partition, and the USB drive needs a GPT partition to work on a Mac.Ĭlick the Yes button to format the drive on the warning message.Ĭonfirm a name for the drive. Quick note: You want to do this before creating the bootable media because there is a good chance that the drive was formatted using a Windows device.

One high-quality USB flash drive with 16GB of storage.Create a GPT partition on a USB flash driveīefore proceeding, you’ll need the following:.Create macOS bootable USB installation media.

Install macos catalina from usb upgrade#

In this guide, you will learn the steps to create a macOS Monterey bootable USB installation on Windows 10, which you can use to reinstall or upgrade the Apple OS. You can use a Windows 11, 10, 8.1, or 7 computer to quickly create a USB bootable installation media to reinstall macOS Monterey, Big Sur, or Catalina on your Mac. However, if none of your devices (MacBook, MacBook Air, MacBook Pro, iMac, Mac Pro, or Mac Mini) are not working when you need them the most, you can use a Windows computer to rescue your Apple device. This is one of the main reasons you should consider making a macOS bootable USB when your device works properly. If the unexpected happens with an Apple computer, you can use a macOS bootable USB with the installation media to repair it. It’s just a matter of time until your computer refuses to start, which could happen for many reasons, including (and not limited to) file corruption, hardware failure, or buggy update. It doesn’t matter whether you use macOS, Windows 10, or Windows 11.