MacRumors published a story that Apple has released the second betas of iOS 15.4 and iPadOS 15.4 to registered developers.

Apple Seeds Second Betas of iOS 15.4 and iPadOS 15.4 to Developers

Apple today seeded the second betas of upcoming iOS 15.4 and iPadOS 15.4 updates to developers for testing purposes, with the new software coming two weeks after Apple seeded the first betas of iOS 15.4 and iPadOS 15.4.

Developers can download iOS 15.4 and iPadOS 15.4 through the Apple Developer Center or over the air after the proper profile has been installed on an iPhone or iPad. Apple warns that the fifth-generation 12.9-inch iPad Pro and third-generation 11-inch ‌iPad Pro‌ will not be able to update to iPadOS 15.4 beta 2 via IPSW, an issue that will be addressed in a later release.

  Apple Seeds Second Betas of iOS 15.4 and iPadOS 15.4 to Developers