Download iOS 8 Beta for iPhone, iPad & iPod touch: Apple has just released the first iOS 8 Beta to developers for download and testing. Developers can get the update by signing into the iOS Dev Center. The dmg for the iPhone 5s weighs in at about 1.8GB!
It is currently possible update to iOS 8 beta without having your iPhone’s UDID registered in a developer account.
We have tested and confirmed it working on two iPhone 5s devices that are not registered in the Dev Center.
To perform the update you must download the iOS 8 ipsw, press and hold the Option key (Shift for Windows) and click Update or Check For Update in iTunes. Select the iOS 8 ipsw from the popup window to install.
Download iOS 8 Beta for iPhone, iPad & iPod touch [Direct Links]