Full release notes for the update are below:macOS Catalina 10.15.4 could be one of the last updates to the macOS Catalina operating system as Apple transitions to working on macOS 10.16, which is unnamed as of yet. Apple says it also addresses an issue with Office 365 accounts, fixes a bug that could cause a USB-C port to become unresponsive, and addresses a problem that caused the 2020 MacBook Air to hang during Setup Assistant or when connecting or disconnecting a 4K or 5K display. The new software introduces a fix that caused Mac computers running macOS Catalina 10.15.4 to be unable to participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier. The macOS Catalina 10.15.4 Supplemental Update can be downloaded from the Mac App Store for free using the Update feature in the System Preferences app. ('') Apple today released a supplemental update to macOS Catalina 10.15.4, two weeks after releasing the macOS Catalina 10.15.4 update ('') with Screen Time Communication Limits and Real-Time Apple Music lyrics. I will not be applying this or any other Catalina updates until this issue has been confirmed to be fixed. I've moved many TB's of data in the last 5 hours since I rolled it back with no issues. Both of my Macs are back and running w/o problem on the same set of discs. The good news is that (if you can "track down" a working 10.15.3 full installer), installing over either 10.15.4 OR 10.15.5b1 works fine. Apple didn't have 10.15.3 available to grab via Terminal, either. I moved the TB6 to a Mac mini also running 10.15.4 to verify the problem was also striking there (without any MBP-related power/nap/sleep complications), and it was indeed. then I saw the original bug report on MacRumors re: KP's with 10.15.4. first I thought it was the RAID - took days chasing that down, multiple wipe/restores/verification passes. I was getting hard locks randomly when hitting disks, even if it wasn't the RAID-5 TB6 - just moving files from the MBP 15" SSD to an external SSD, both APFS formatted. This has got to be impacting many professional users! I jumped through huge hoops to reinstall with 10.15.3 today to fix the kernel-panic/lockup that strikes when accessing external storage (ThunderBay 6, SoftRaid XT). I'm shocked and frustrated that Apple doesn't address this in the 10.15.4 Supplemental Update. MacOS Catalina 10.15.4 could be one of the last updates to the macOS Catalina operating system as Apple transitions to working on macOS 10.16, which is unnamed as of yet. Fixes an issue where Mac computers running macOS Catalina 10.15.4 could not participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier - Resolves an issue where you may repeatedly receive a password prompt for an Office 365 account - Fixes an issue where MacBook Air (Retina, 13-inch, 2020) may hang in Setup Assistant or when disconnecting and reconnecting a 4K or 5K external display - Resolves an issue where a USB-C port in your Mac may become unresponsive MacOS Catalina 10.15.4 supplemental update improves the stability and security of your Mac. Full release notes for the update are below: The new software introduces a fix that caused Mac computers running macOS Catalina 10.15.4 to be unable to participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier.Īpple says it also addresses an issue with Office 365 accounts, fixes a bug that could cause a USB-C port to become unresponsive, and addresses a problem that caused the 2020 MacBook Air to hang during Setup Assistant or when connecting or disconnecting a 4K or 5K display. Apple today released a supplemental update to macOS Catalina 10.15.4, two weeks after releasing the macOS Catalina 10.15.4 update with Screen Time Communication Limits and Real-Time Apple Music lyrics.
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