Disclaimer: Downgroading to the iOS 6 version will not be easy. Any comments appreciated here.
Follow next steps (Important: This blog is not responsible of any damage or problem you can cause on your device doing this update):
- Download the iOS beta image for your device. You can find some links here http://www.evad3rs.net/2013/04/ios-7-download-install-links-how-to.html.
- Important, do an Update don't do a Restore. Do an update from iTunes while press the alt key, a file explorer should appear, then select the dmg previously downloaded.
After the update your iOS device should be updated to the iOS 7.