Updated: macOS Catalina 10.15.4 supplemental update reportedly breaking some Macs

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Update- Apple Says New Beta Fixes Issue

On Wednesday Apple released macOS Catalina 10.15.5 beta 3, in the change log for the update Apple says:

Large data transfers to RAID volumes no longer cause Finder to become unresponsive. (61307708)

We expect this update to also include a fix for the issues outlined below, however this remains untested.

On Wednesday, Apple released a small supplemental update to macOS Catalina 10.15.4 to fix a FaceTime bug that prevented users from making calls with devices running older firmware, some improvements to the 2020 MacBook Air, and other under the hood type of things.

The update came 2 days after a report from MacRumors highlighting how “users are experiencing occasional system crashes” more specifically when trying to transfer a large file. SoftRAID in a post even went as far as to say “There is a serious issue with 10.15.4.” and that they are working with Apple engineers on a fix.

That fix is apparently not included in the supplemental update we got last week. A new report by TechRadar highlights how the update seems to actually be breaking Macs. As noted by TechRadar’s report one reader of 9to5mac said that the update bricked their 2016 MacBook and another user cited issues with the 2012 Mac Mini which “ran ‘insanely slow’ when it eventually finished installing, requiring a restore from Time Machine.”

Other posts on other forums such as Apple Insider‘s, MacRumors, and even Apple’s own support community had additionally reports of the update bricking Macs, with even the 2019 16-inch MacBook Pro reportedly breaking.

While it’s yet to be clarified which models of the Mac are being impacted by the update, it is worth noting the number of users coming forward about their experience. If you have yet to update and aren’t experiencing any current issues on macOS Catalina 10.15.4, we would advise holding off updating until we know more.

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Sami started falling in love with Apple in 2010 with the iPhone 4S. As a registered developer, he deeply admires the world of Apple. Sami is an aspiring journalist, writer, and actor. He also has devoted his life to sharing his passion and knowledge with others around the world.