It seems that on the fifth beta version iOS 11.4 has not been tested. Apple released iOS 11.4 beta 6 for developers.
The assembly number is 15F5079a .
The update does not contain any global changes. Only fixes errors and increases stability.
Probably, soon the firmware release will already take place. After all, it’s not going to be Apple just letting out so often beta builds.
Download iOS 11.4 beta 6 can now “by air.
Links for direct downloading the firmware
In case the update does not appear in the Software Update section .
Set via Shift + Refresh , or Option (Alt) + Refresh . Choose a file and roll up the update via iTunes.
Important : you need a developer profile to install this firmware.