Download beta versions of Apple's iOS, iPadOS,
macOS and tvOS firmware.
Here is how to get iOS 17 beta and iPadOS 17 beta directly on your device (OTA).
Learn more: How to install a beta IPSW file →
A release candidate build (RC) is typically the final build of a piece of software in the beta stages for developers. Typically it is the final build before a major release.
Up until before iOS/iPadOS 14.2, Apple used Golden Master (GM) but with 14.2 that changed to release candidate.