Apple on Monday issued a slightly revised build of iOS 11 beta 2 for iPhone, iPad and iPod touch, as well as an updated build of tvOS 11 beta 2 for the fourth-generation Apple TV.

The new builds appear on select devices only.

iOS 11 Developer Beta 2 Update 1, as it’s called, has the build number of 15A5304j, up from the build number of 15A5304i in iOS 11 beta 2 which was seeded to developers five days ago.

According to the official release notes on Apple’s Dev Center portal, iOS 11 Developer Beta 2 Update 2 resolves an issue preventing reverting to iOS 10 from iOS 11 beta.

To revert to an earlier version of iOS, follow the instructions shown in Apple’s support doc.

As for the updated tvOS 11 beta, the new version has a higher build number of 15J5310h versus build number of 15J5310e for the original tvOS 11 beta 2.

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The revised beta builds may also patch dangerous exploits while addressing performance issues on older hardware like iPhone 6.

iOS 11 cuts off 32-bit devices like the iPhone 4s/5/5c handsets.

The new builds are available over the air via the Software Update mechanism in Settings on iPhone, iPad, iPod touch and Apple TV. As mentioned before, they appear on select devices.

Build numbers for beta 2 of macOS High Sierra 10.13 and watchOS 4 have stayed intact. Public betas of iOS 11, macOS High Sierra 10.13 and tvOS 11 are coming later this month.

watchOS betas are currently unavailable for public beta-testing.