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.
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