Upgrading iPhone to IOS 7 Beta 1 without developer access to IOS Dev Center

As you are aware, Apple has announced new version of iOS software for iPhone. Yes, it is iOS 7 and officially will be released in this Fall, long enough to wait ? :)
If you can't wait to try it, you can try its beta version which already available to download. Unfortunately, you need developer access to iOS Dev Center to download iOS 7 Beta 1.
However now it is possible to download iOS 7 Beta 1 without access to Dev Center and then you can happily install it. All you need to do as follow..

First, you need to download 2 iOS softwares, 1st download your latest official iOS software and 2nd iOS 7 beta 1. Save it to your computer  i.e desktop folder.
In this case, my latest iOS version is 6.1.4 (10B350),  refer to your iPhone setting (setting > general > about) for the right version of your latest iOS software. You can download official iOS software from this link: http://www.felixbruns.de/iPod/firmware/.

Then you can download iOS 7 Beta 1 version from this link http://geeksays.com/download-ios-7-betas/. Now we have 2 iOS softwares in computer hard disk; iPhone5,2_6.1.4_10B350_Restore.ipsw and iPhone5,2_7.0_11A4372q_GDELUXE.COM_Restore.ipsw


Connect your iPhone to iTunes and backup your iPhone. Click iPhone in iTunes.

In order to update iOS 7 by forcing iTunes to use iOS file in hard disk, you can press shift + click "check for update" in iTunes. In my case (Macbook), press option button (alt) and click "check for update".

It will prompt you file selection window. Select iPhone5,2_7.0_11A4372q_GDELUXE.COM_Restore.ipsw then UPDATE.

Installation process will start immediately and let it finish.
The same thing, if you decide to restore your iOS to your latest official version, you can press shift button (option button for mac user) plus click 'restore iphone..." button in iTune and then select latest official iOS version, in my case is iPhone5,2_6.1.4_10B350_Restore.ipsw.

Enjoy it !