iOS 10.3.3 Beta 6 is Currently Available in 3uTools
Apple Releases Sixth iOS 10.3.3 + macOS 10.12.6 Betas, the beta version only includes new wallpapers for the 12.9-inch iPad Pro and no other visible changes, you could use 3uTools to upgrade or downgrade your iDevice to this version.
Today 3uTools tests an iPhone 7 which is running iOS 11 beta2, we downgrade it to iOS 10.3.3beta 6 as reference.
- How to Upgrade to iOS 12.1.4 in 3uTools? 3uTools Supports Downgrade iPhone 6s to iOS 10.3.3 from iOS 11 3uTools Flashes iOS4.0~iOS11 in Easy Mode Tutorial How to Downgrade iOS 11 Final Back to iOS 10.3.3 Using 3uTools? iOS 10.3.2 Is Available in 3uTools For Users Flashing Downgrade iPhone from iOS 11 Beta3 to iOS 10.3.2 Downgrade Your iPhone from iOS 11.2.5 Beta to iOS 11.2 Without Losing Data iOS 10.3 Now Available To Download On 3uTools