After the big announcements of the OS X 10.11 El Capitan Beta 1 and iOS 9.0 Beta 1 operating systems, Apple has released earlier today, June 9, the fourth Beta of the upcoming iOS 8.4 mobile operating system for iPhone, iPad, and iPod touch devices.

According to the internal release notes, which are available only for developers, iOS 8.4 Beta 4 Build 12H4125a is here to fix an issue with Siri as it could not be used to control iTunes Radio in the previous Beta of the operating system.

As you might know, iOS 8.4 will introduce a redesigned Music app that has been mediatized in the last couple of months and demoed by Apple during its keynote speech at the WWDC 2015 event.

IOS 8.4 download links have just gone live for supported iPhone, iPad and iPod touch devices. Full changelog along with instructions on how to download iOS 8.4 is detailed below. Each new installment of iOS 8.x has brought with it a healthy fleet of changes and improvements. With iOS 8.3, it was a. Apple has just released the new iOS 8.4 beta 3 download for iPhone, iPad and iPod touch devices. Info on what is new, along with where to download it from is detailed here. The design changes introduced in the Music app however, have come ahead of the redesigned streaming service which could be.

Apple has also unveiled its brand-new Apple Music service to go with the revamped Music app in iOS 8.4. As such, it has been announced that the final release of iOS 8.4 will arrive at the end of the month, on June 30, 2015, with Apple Music support.

iOS 8.4 Beta 4 is available only for developers, so you should head over to your Apple Developer account, which has gotten a redesign lately, and download iOS 8.4 Beta 4 Build 12H4125a for your device(s).

Please try to keep in mind that this is a pre-release piece of software and certain issues remain unresolved. Also, you won't be able to return to iOS 8.3 or any previous Beta of the iOS 8.4 operating system. iOS 8.4 Beta 4 Build 12H4125a is now available for download for iPad 2 (Wi-Fi) (iPad2,1), iPad 2 (GSM) (iPad2,2), iPad 2 (CDMA) (iPad2,3), iPad 2 (Wi-Fi, 2012) (iPad2,4), iPad mini (Wi-Fi) (iPad2,5), and iPad mini (GSM) (iPad2,6).

The iPad mini (CDMA) (iPad2,7), iPad 3 (Wi-Fi) (iPad3,1), iPad 3 (CDMA) (iPad3,2), iPad 3 (GSM) (iPad3,3), iPad 4 (Wi-Fi) (iPad3,4), iPad 4 (GSM) (iPad3,5), iPad 4 (CDMA) (iPad3,6), iPad Air (Wi-Fi) (iPad4,1), iPad Air (Cellular) (iPad4,2), iPad Air (China) (iPad4,3), iPad mini 2 (Wi-Fi) (iPad4,4), iPad mini 2 (Cellular) (iPad4,5), iPad mini 2 (China) (iPad4,6), iPad mini 3 (Wi-Fi) (iPad4,7), iPad mini 3 (Cellular) (iPad4,8), iPad mini 3 (China) (iPad4,9), iPad Air 2 (Wi-Fi) (iPad5,3), and iPad Air 2 (Cellular) (iPad5,4) devices are also supported.

It also works on iPhone 4s (iPhone4,1), iPhone 5 (GSM) (iPhone5,1), iPhone 5 (CDMA) (iPhone5,2), iPhone 5c (GSM) (iPhone5,3), iPhone 5c (CDMA) (iPhone5,4), iPhone 5s (GSM) (iPhone6,1), iPhone 5s (CDMA) (iPhone6,2), iPhone 6 Plus (iPhone7,1), iPhone 6 (iPhone7,2), and iPod touch 5G (iPod5,1) devices.

As soon as the macOS Catalina beta goes public, it is open to anyone willing to take a risk on dealing with the unfinished product. Before you get started, you should make sure your Mac is ready for the download and installation process.

If you're wondering what macOS Catalina is all about, check out our FAQ:

Apple occasionally offers updates to iOS, watchOS, tvOS, and macOS as closed developer previews or public betas for iPhone, iPad, Apple TV and Mac (sadly, no public beta for the Apple Watch). While the betas contain new features, they also contain pre-release bugs that can prevent the normal use of your iPhone, iPad, Apple Watch, Apple TV, or Mac, and are not intended for everyday use on a primary device. That's why we strongly recommend staying away from developer previews unless you need them for software development, and using the public betas with caution. If you depend on your devices, wait for the final release.

What to know before you start: Is my Mac eligible for macOS Catalina?

The macOS Catalina beta will run on the following devices:

• MacBook (2015 or newer)
• MacBook Air (2012 or newer)
• MacBook Pro (2012 or newer)
• Mac mini (2012 or newer)
• iMac (2012 or newer)
• iMac Pro (2017 or newer)
• Mac Pro (2013 or newer)

Step 1: Clean up your Mac

Make sure your Mac isn't overstuffed with unnecessary extra files. Thanks to Optimized storage in macOS, you can quickly clean up your Mac with just a few steps.

Step 2: back up your Mac

Seriously. Back it up. Even if you have scheduled backups every night, just push a manual backup before you get started. It's the right thing to do. The easiest way to back up your Mac is with Time Machine, but there are plenty of other ways you can back it up that work just as well.

Step 3: Decide how you are going to download the macOS Catalina public beta

You can download and install the macOS Catalina public beta directly onto your computer if you have a spare lying around that you don't use as your daily driver. If you don't have a spare, but still want to test the new operating system, you can partition your hard drive and boot it on the partitioned drive.

You can also download the public beta onto a thumb drive so that you can install it on multiple computers without having to re-download each time.

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Step 4: Download the macOS Catalina public beta

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Your Mac is ready to go. Now all you have to do is download and install the macOS Catalina public beta once Apple launches it.