Apple has released iOS 6.1 beta 4 for developers which is compatible with iPhone, iPod Touch and iPad. Alongside iOS 6.1 beta 4 an updated iOS for Apple TV is also released.
Developers can download iOS 6.1 beta 4 through link below or as an OTA update if their iDevice is over previously released iOS 6.1 beta, just by navigating through “Settings” > “General” > “Software Update” > “Install Now” on device.
Download iOS 6.1 Beta 4