Apple Released Beta 4 of iOS 12.3, macOS Mojave 10.14.5, tvOS 12.3 and watchOS 5.2.1 to Developers

Apple released the beta 4 of iOS 12.3, macOS Mojave 10.14.5, tvOS 12.3 and watchOS 5.2.1 to developers for testing. The public beta will be also available soon. These betas are available for developers who joined Apple developers program or public beta tester program and who also have compatible iOS devices.

iOS 12.3 Beta 4

Apple released iOS 12.3 beta 4 for testing right after one week of beta 3 releases and one month after the second beta of iOS 12.3 which introduced the new Animoji, Apple News+ and more. This beta 4 comes with build number 16F5148a and it’s available for developer program users. This build of iOS 12.3 beta 4 is available for all the Apple compatible devices like the iPhone and iPad. Apple rapidly released its beta version to both Apple developers and public beta testers. It’s the fourth beta of iOS 12.3.

iOS 12.3 beta 4 release with a number of changes such as Wallet app tweak, Apple TV app, and many bug fixes. There are no UI changes in this beta version of iOS, this update is likely most focus on performance improvements and bug fixing.

Download iOS 12.3 beta 4

Anyone who already installed the beta version of iOS on compatible iPad, iPod Touch, and iPhone devices, can install this update from over the air by going into settings > General > Software Update. Or if you wish to install the beta version


Developers can download iOS 12.3 beta 4 from here.

macOS Mojave 10.14.5 Beta 4

Along with iOS 12.3 beta 4, Apple also releases macOS Mojave 10.14.5 Beta 4 to developers for testing with build number 18F127a. it’s not a major update, this build released with performance improvements and simple bug fixes.


  • Resolved Issues
    • Copy-protected video content plays back correctly on iMac Pro. (49174801)


  • Resolved Issues
    The Accessibility Events switch was removed, because related aspects of the W3C AOM effort are no longer applicable. (49784417)

Date and Time

  • New Feature
    Support for the Reiwa (令和) era of the Japanese calendar, which begins on May 1, 2019, is now available. The first year of Japanese-calendar era is represented as  “元年” (“Gannen”) instead of “1年”, except in the shorter numeric-style formats which typically also use the narrow era name; for example: “R1/05/01”. (27323929)


  • New Features
    Kernel extensions signed after April 7th, 2019 must be notarized in order to load on macOS 10.14.5. (50016570)

Download macOS Mojave 10.14.5 Beta 4

The user who enrolls Apple beta programs can download this beta of macOS Mojave 10.14.5 through Software Update mechanism of App Store for those who already installed the previous beta of macOS Mojave or via developer center website for developers only or Apple beta testing website for beta tester only.

tvOS 12.3 beta 4

Like both iOS 12.3 and macOS Mojave 10.14.5, tvOS is also released with minor bug fixes and performance improvements. tvOS 12.3 beta 4 build number is 16M5146a. This build is also released to developers for testing.

Apple TV owners can update their tvOS to final version by heading over to software update System > Maintenance > Software Update.

WatchOS 5.2.1 beta 4

WatchOS 5.2.1 beta 4 is also released with some bug fixes and some under the hood performance improvements. There is no major update or changes found in this build of WatchOS 5.2.1 beta 4.

After the configuration profile on Apple developers program, then the new watchOS beta version can is downloaded through iPhone watch app by navigating to General>Software Update.


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