Apple just seeded it’s second beta for iOS 8.4 to developers and registered devices. If you are running Beta 1, simply head over to Settings>General>Software Update to download this version for OTA download.

We recommend waiting till the IPSW becomes available online and installing through iTunes in order to prevent malfunctions once the future jailbreaks roll out. (OTA updates have been proved to cause malfunctions)

To install through iTunes, hold Shift (PC) or Options (Mac) and click on Check for Update and select the IPSW file. This method will ensure that you keep all your apps, pics, music, etc.

As always, install at your own risk. Beta software can be unstable and cause problems with your iDevice