Level 1

19 points

Catalina 10.15.4 Supplemental Update Has Issues

The 8 April 2020 Supplemental Update for Catalina 10.15.4 brought the system down for a few hours. Since the screen only showed a white apple on the screen for the whole time I shut it down and restarted it. I got a thick white circle with a thick white line through it in the middle of the screen, the same size as the apple usually is. Repeated shut downs did nothing. Could not go to safe mode without the circle and line so I went to Recovery Mode, ran the Disk Utilities First Aid and then rebooted again. My screen came up and I was able to sign in. I had a notice that the update was available for installation. I am not going to do that since it appears it is not going to work on my iMac (Retina 5K, 27-inch, 2017). Is this a temporary issue or should I ignore all further updates?

iMac 27" 5K, 10.15

Posted on Apr 8, 2020 7:42 PM

Top-ranking reply

Jayseph

Level 1

51 points

Posted on Apr 11, 2020 7:13 AM

I am not sure how many people this long post will help, but hopefully it will help some:

I was unsure why my MacBook Pro would install this supplemental update without a hitch, but my one month old iMac would not. Every time I rebooted my iMac, even after a Time Machine restore that seemed to work, I would get the circle/slash symbol and not be able to boot up my machine. After texting Apple Support last night, they advised that I should bring my computer in as it seems like there is a hardware failure. I didn’t see how in the world that would be possible with just a software update and a brand new machine.

This morning, I called Apple Support and talked to someone who was really great. She was very helpful as I discussed the issue. And then we tried something different. I removed all external hard drives and my CD-ROM drive and then booted up my machine. I was shocked to see that it booted up just fine. No dreaded circle/slash symbol. When my machine was back up, I then installed the supplemental update, this time without any issues.

There is one issue that is still there and that is if there are any externals attached when rebooting my machine, it will give me the slash/circle symbol and not boot up properly, but when they are disconnected everything is fine. Obviously, this is annoying and something that needs to be fixed, but at least I know that it is not a hardware issue with my computer and I don’t need it serviced.

Catalina has been a nightmare of an OS. I am hoping that these issues are finally taken care of and that there is a stable system put into place soon.

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69 replies

May 13, 2020 7:20 AM in response to Barney-15E

Hi Barney,

If I zoom in and zoom out the display and it was lag.

and CPU 103%. I don't know why. It's my first time to use MAC laptop.

please find my recording: https://mega.nz/file/jW4j3SjB#3xjciEMUE8Pvzb3dGbXJXuNcDJorpc0DCCnvDJV7RxM

Wynne

Jayseph

Level 1

51 points

May 29, 2020 12:11 PM in response to tim01

Does anyone know if the new update 10.15.5 handles these issues? Or do more issues crop up? Has anyone who had start up issues with the 10.15.4 supplemental update installed the new update? I am really nervous about any new update coming now...

Gubi

Level 1

13 points

Apr 8, 2020 8:24 PM in response to tim01

Same problem here. Currently stuck on gray Apple screen.

dialabrain

Level 10

135,821 points

Apr 8, 2020 10:45 PM in response to Gubi

FWIW, like John, I installed the supplemental update on two of my Macs without incident.

hi5arp

Level 1

8 points

Apr 10, 2020 7:05 AM in response to tim01

hey tim, how do you go by Safe Mode, like ho do you do in MAC to get this?Commands please.

Apr 10, 2020 12:42 PM in response to tim01

I can only say that I've not had any problems (that I know of) from deleting mine...

ritams

Level 1

13 points

Apr 12, 2020 9:17 AM in response to Robotical

Mine too. After updating my MacBook Air 2017 was working fine. Today it just shutdown. And nothing is working.

ritams

Level 1

13 points

Apr 12, 2020 9:19 AM in response to MrAnykey

Mine too. Tried everything.

7thworld

Level 1

4 points

Apr 12, 2020 10:41 AM in response to bo6340

Wow, I feel like I really dodged a bullet here, as I previously posted I ran the supplemental update on 4/10, on Mac Pro (2013), Macbook Pro (2017) and Macbook Pro (2018) and experienced zero issues.

Apr 12, 2020 3:16 PM in response to tim01

While installing this update the screen of my macbook pro turned black and my mac never switched back on. I have to send it in to an apple service provider.

Apr 13, 2020 9:56 AM in response to bo6340

The only other Mac I have to hand is a 2015 13" rMBP. Would I need some sort of dongle to connect it up to that?

bo6340

Level 1

4 points

Apr 13, 2020 10:38 AM in response to ASCarlisle

If I'm reading the instructions correctly— it looks like you can use a USB Type-C to USB-A cable to connect the 2 computers. Good luck, hope it works for you!

Apr 13, 2020 10:51 AM in response to bo6340

Thanks! Unfortunately I haven't got one of those in the house. Amazon is saying Saturday for delivery - will see if it arrives before the UPS van comes to take my machine in for repair!

rexflagg

Level 1

8 points

Apr 14, 2020 7:02 AM in response to tim01

Since Catalina 10.15.4, waking up my MacBook Air requires a restart.

Apr 16, 2020 9:16 AM in response to ClassicII

Nice! Very helpful article.

Sadly tried the revive option but this always just failed for me. 😕

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Catalina 10.15.4 Supplemental Update Has Issues