If the unexpected happens with your mac computer and refuses to start, then it's time to use UltraDMG to rescue your Mac.
It doesn't matter whatever the operating system you’re using (macOS or Windows), you may often encounter the issues that your computer refuses to start normally, however, this could happen for many uncertain reasons, such as system crashes, file corruption, hardware failure, Viral infection or buggy updates and other unknown factors. Based on these circumstances, you will need a DMG burner software to create a macOS installation media so that you can repair or reinstall your macOS at any times all by youself.
macOS resfuses to start normally
macOS won't restart after update
macOS won't boot past Apple logo
macOS won't boot after power outage
macbook hardware failure
macOS crashes after sleep
Reinstalling macOS with USB is not a challenge any more, UltraDMG serves as dependable ISO burning tool to help you create a macOS bootable install media within just few clicks, no command prompt and risk free. Whether your macOS get failed to start by updates or file corruption, this utility still can help you bring your mac back to life.
It supports burning 5+ image file to USB flash drive or DVD/CD, including DMG, Bin, Img and Raw.
The built-in DMG image analysis algorithm makes it possible to directly recognize dozens of different DMG image files, then allows you to extract all content from your DMG file to your computer and save them according to the original file structure, then you can easily open and view your DMG files on a Windows computer.
Secure 
Direct 
Fast 
Automatic 
The easiest and fastest way to reinstall macOS is to use a install disk, which can be used to reinstall and repair macOS when your mac can't be start. SYSGeeker UltraDMG lets you create a bootable macOS install disk from USB drive and DVD/CD within only few clicks, once you have a install disk in hands, then you can use it unlimited times for lifetime.
Create with CD/DVD
You can create a macOS install disc with CD/DVD in one click. Support all external or built-in DVD/CD models.
Create with USB Flash Drive
It supports up to 30+ kinds of USB drives made by SanDisk, Kingston, Toshiba, Samsung and more , whatever they're USB 2.0 or 3.0.
Step 1. Create A macOS Install USB/DVD
Download and install DMG Burner tool on your computer, then launch it, select Burn option to make a bootable USB/DVD from your DMG image..
Step 2. Import Your DMG and Connect USB
Import your DMG image file and insert your USB drive or DVD/CD to your computer.
Step 3. Start to Write DMG Image
Click Burn button to start writing DMG image to your USB drive, once finished successfully, you will get a bootable installer USB.
UltraDMG is an extremely easy-to-use DMG burning tool that is suitable for computer novices, no complex settings, all you need to do is install, import and burn.
One your created a macOS install USB successfully, then you can use it unlimited times for lifetime free.
Run on both old and new Mac operating systems, ranging from Mac OS X (10.9 -10.12) to maacOS (10.13-15).
It will take only 5- 10 minutes to write the DMG image to your disk and then it perform a verification to check whether it can be boot normally.
Download this best DMG burner software to help you create a macOS install USB and save your Mac.
Windows 
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