Apple just unveiled iOS 8 at the Worldwide Developer's Conference, and it has a lot of exciting features to play around with. Unfortunately, it won't be available to the public until this coming fall—but that doesn't mean you can't get it right now.
There is a way to get iOS 8 beta on your iPad, iPhone, or iPod touch early, but you will need to either be a developer, know a developer, or spend $99 to become a developer. (By the way, you can get the Mac OS X 10.10 beta today, too. Click here to see how.)
Back Up Your Device
Before going any further, make sure your iPhone is backed up via iTunes.
For more info on this, check out my guide to freeing up space.
Log in to the iOS Dev Center
You need to be enrolled in the iOS Developer Program to download iOS 8 beta, which costs $99/year, or know a developer who can add your device to their account. Sign in (or have them sign in) to the iOS Dev Center.
Accept the New Agreement
You should be prompted to accept to the new agreement, otherwise the iOS 8 beta tab will be grayed out, as seen below. If you aren't prompted and you can't click on the iOS 8 beta tab, look for the yellow box up top to accept the new license agreement.
Make sure you click on the iOS 8 beta tab before downloading—you don't want to download the iOS 7.1 image accidentally.
Download the Correct ISPW File for Your Device
After agreeing to the new terms, you should now be able to access the iOS 8 beta tab. Then, scroll down to the "Downloads" section and make sure to read the warnings before proceeding.
Go ahead and download the correct .ispw file for your model iPad, iPhone, or iPod touch. If you don't know your model number, you can find it on the back of your device; it will start with the letter "A". Make sure the file is the correct one, or you could experience a fatal brick.
Go to Certificates, Identifiers, & Profiles
Now, in the iOS Dev Center, navigate to the "Certificates, Identifiers, & Profiles" section. The link can be found up top under the "iOS Developer Program" menu. Select "Devices" under the "iOS Apps" section of this window.
Add Your Device to the List
100 devices can be registered to each developer account. Make sure you're in the "All" section under the "Devices" tab, then click the "+" sign to add a new device.
Locate Your Device's UDID
Make sure your device is connect to iTunes. With your iPad, iPhone, or iPod touch selected, head to the "Summary" tab, then click on your "Serial Number" a few times until your "UDID" number pops up.
That is what you want.
You can use the keyboard shortcut (Command+C) to copy it to your clipboard, or right-click on it and select "Copy".
Register It as a Developer Device
Back in the iOS Dev Center, after you clicked on the "+" sign, add a name for the device, enter its UDID, and hit the "Continue" button.
Update or Restore Your Device
Now that your device is registered as a developer device, and that you have the .ispw file on your computer and your device backed up, head back to iTunes. In the "Summary" tab, option-click (or shift-click on Windows) on either "Check for Update" or "Restore iPhone...".
The update option will simply update your device, while the restore option will wipe it and install a fresh version of iOS. You can perform a "Restore Backup..." later if you want to get your apps/data back.
If you select the "Restore iPhone..." option, you will have to disable "Find My iPhone" first on your device, if it's enabled. Updating does not require this.
Find My iPhone must be disabled first if you select "Restore iPhone..."
Select the IPSW File for Your Device
After option-clicking, find the .ispw file you downloaded earlier (probably in your Downloads folder), select it, and click "Open".
Then, click on "Update" at the prompt" and wait for iOS 8 beta to be installed on your device.
The phone will guide you through the rest of the install process.
Downgrading Back to iOS 7.1.1
If for some reason you want to uninstall the beta from your iPhone, you can. Check out my guide on downgrading from iOS 8 beta to iOS 7.1.1 to get your iPhone back to normal.
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