https://wccftech.com/apple-seeds-beta-2-of-ios-11-4-1-macos-10-13-6-and-tvos-11-4-1-to-developers/

Today, Apple has seen fit to release the second beta of iOS 11.4.1, macOS 10.13.6 and tvOS 11.4.1 to developers for testing purposes. The second beta arrives two weeks after the company seeded the first beta. So let’s dive in to see whether Apple has integrated further extensions in terms of functionality and how you can install beta 2 of the respective firmware updates on your respective devices.

If you’re willing to install iOS 11.4.1 on your iPhone or iPad, you should be a registered developer. if you are, you can install it from Apple’s Developer Center or via the over-the-air mechanism. However, do make sure that a proper configuration profile is required from the Developer Center.