iBetaDownload:iOS苹果系统测试下载网是一个提供苹果最新beta版系统下载和最新消息的网站，提供iPhone、iPad、iPod touch的最新beta版系统下载和测试包。

iBetaDownload is not responsible for what may happen to your device as a result of using anything listed on our website. Download and utilize at your own risk. iOS 7 is supported on the iPhone 4, 4S and 5, the iPad 2 - 4, and Mini, and the iPod touch 5.

How to extract a DMG on Windows:

1、Get your UDID registered from any reputable source；

2、Download iOS 7 from iBetaDownload website；

3、Plug your device into your computer, and make sure to back it up；

4、Hold Shift (Windows) or Alt (Mac) and click 'Restore' in iTunes；

5、Select the iOS 7 file and wait for it to restore；

6、Enjoy! Make sure to regularly update to the new betas that come out.

这里提供一份How to extract a DMG on Windows的视频教程，有需要的用户可以下载下来看看！点击直达