Apple Today Released macOS Catalina 10.15.4 Supplemental Update (19E287)
UPDATE 4/24/20: Another issue found. On some Macs, the ComputerName and HostNames are being reset to default after installing the Supplemental update.
UPDATE 04/10/20: I have noticed increased traffic to my Mac BridgeOS DFU Restore Article. I looked around a bit found a small number of reports that the 10.15.4 Supplemental Update is Bricking T2 Macs. To the user the Mac seems dead. I had 3 different reports sent to me and found 3 other report posts. The good news is, a BridgeOS restore was able to bring some of the Macs back to life.
In a surprise today, Apple released a new Supplemental update for macOS Catalina 10.15.4. This update weighs in at 1.01gb and is available now for all 10.15.4 Catalina users. This update looks to fix 4 different issues. Apple also updated BridgeOS and re released a new installer.app, combo update and delta update.
The Catalina 10.15.4 Supplemental Update Includes the following fixes.
macOS Catalina 10.15.4 supplemental update improves the stability and security of your Mac.
- 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
BridgeOS update
The T2 BridgeOS was updated in this macOS Catalina Supplemental Update.
T2 BridgeOS Version = 17.16.14281
Current and Previous Build Versions of 10.15
- 10.15.4 = (19E287) April 8th, 2020 = Current Release
- 10.15.4 = (19E266) March 24th 2020
- 10.15.3 = (19D76) January 28th 2020
- 10.15.2 = (19C57) December 10th 2019
- 10.15.1 = (19B2106) November 13th 2019
- 10.15.1 = (19B88) October 29th 2019
- 10.15.0 = (19A603) October 21st 2019
- 10.15.0 = (19A602) October 15th 2019
- 10.15.0 = (19A583) October 7th 2019
Links – Supplemental Update + Combo & Delta
Supplemental Update =
Size = 1.02gb
https://support.apple.com/kb/DL2038
Delta Update =
Size = 3.0gb
https://support.apple.com/kb/DL2036
Combo Update =
Size = 4.73gb
https://support.apple.com/kb/DL2037
If I deployed/cached the old 10.15.4 Installer.app for OS Upgrades, do I need to redeploy?
Do I have to replace my deployable 10.15 Installer.app? – Yes
If you deployed the old version of the 10.15.4 (19E266) Installer, you should update it to the new (19E287). If you don’t your users will have to install the New Catalina Supplemental Update after installing or upgrading.
Security Content
The Supplemental Update does not list any Published CVE entries.
This update break my Mac, I suspect T2 update because my power button don’t work.. Mac book pro 15 » 2018 with core i9
Jeff, I have seen a spike of reports of this happening with the 10.15.4 combo and supplemental updates.
I just updated this article that shows how to restore BridgeOS on a Mac that was Bricked after a macOS update.
https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/
Thanks, It works again.. Unfortunatly the process erase entirely the disk… but fortunately macOS have a very efficient backup system.. restore in progress … thanks for all… and #stayathome
Hi,
same here. MBP 2018 Touch Bar. Completey dead. I susect T2 BridgeOS update.