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Once finished, the bootable USB drive should be ready and you can insert it to your Mac device and begin installing. Restoring image to Disk may take 15 minutes to 45 minutes and you will see the Restore Complete prompt after done. Step 4: Click Yes to go ahead if you are asked for confirmation. Step 3: Click the three dots to browse the DMG files containing macOS installation files. Step 2: Click Yes to continue wiping the data from the USB drive. Step 1: Right-click the USB drive and select Restore with Disk Image. Step 4: Confirm the format by clicking Yes when you are presented with last warning. Step 3: Name the volume and click OK in Format Drive for Mac prompt. Step 2: Click Yes if the Warning window pops up. Step 1: In TransMac, right-click on your USB drive and select Format Disk for Mac on the left pane. Step 3: After you finished installation, click on Run button to continue. If you just prepare for a bootable USB this time, the trail version is more than enough. Though the TransMac is a paid software, it also offers a 15-day trial. Step 2: Download and install TransMac on your Windows computer. Step 1: Connect the USB drive to your Windows device and make sure all the data is backed up. Download DMG fileÄownload the version of macOS which is compatible with your Mac device from the Apple Download center, and you will get the DMG files for the latest version of macOS Catalina, macOS Mojave or macOS X Lion. Type the following command and hit Enter: dmg2img sourcefile.dmg destinationfile.iso Step 3. Open File Explorer and go to the folder containing the DMG2IMG program, then right-click and select 'Open command windows here.' Step 2. Guide on creating macOS bootable USB drive: 1. Download DMG2IMG and install it in your Windows PC. You'd better back up the important data on the USB drive since the drive will need to be formatted afterwards. A USB drive with at least 16GB of storage.To create a macOS bootable drive, you will need to prepare for the following: This article will guide you to create a bootable macOS USB installer in Windows. However, the support for Catalina is not good as Mojave and High Serrira. Its one of the quickest methods to create macOS bootable USB drive from dmg file. TransMac is a single-purpose utility to open Mac disk image from a Windows PC. It's not a difficult matter to create the macOS bootable USB drive on a Mac device, but what to do if you don't happen to have any other Apple device around? In such case, you can seek for a Windows computer, whether Windows 11, 10 or 7 is feasible. Method 3: Use TransMac to Create macOS Catalina Bootable USB in Windows 10. If you someday find that your Mac refuses to start, a system repair can be done with the macOS bootable USB installation media, with which you can reinstall or reset the system.