macOS 15.4 update failed on external disk

Did you do anything different to get the successful install, or just perseverance?

Latest update from my end is that I have now installed 14.7.5 as my work volume as recommended by a senior apple technician and am stuck using that at until the issue is resolved apple’s end.

To summarise, I have a personal volume on 15.4 which was restored via DFU since device was in a non-working state after erasing the drive to try and fix, and a work volume on 14.7.5, both on internal SSD. I tried the upgrade from 14.7.5 to 15.4 but this failed in the same way as the others had previously. Apple support have raised this with their engineering team and I’m currently waiting to hear back. The technician I was speaking to seemed to think it would be something that would need to be resolved with a 15.4.1 type patch once they have identified the root cause.

My device is a base model 14 inch M1 pro (2021)

Here is related topic Ithink: M1 macbook pro fails to upgrade to Sequoi… - Apple Community

Afraid not, both of my volumes are normal APFS. I've also since tried reinstalling macOS again using the recovery mode and a USB recovery drive, while creating a new volume for personal use without success. I've attached the error log output that I am receiving when it reboots automatically into my work volume after the failed install.

It looks like something is causing a kernel panic during the initial setup after reboot. I've reported it to apple using the built in prompt.

All drives had 15.3.2 I booted each one up and then applied the 15.4 update as any normal process would follow.

And the problem also occurred on a clean installation of 15.3.2 after the above. Which means that 15.4 changes the Firewall settings on Mac

Exactly the same. I believe that it will be fixed quickly and 15.4 will finally be released on the Appstore which until now did not exist !

We have installation issue 15.4 on external drive to MacBook Air M1

which one Mac model you are using

All my external drives have FileVault on and no issue with updating so I suspect some other issue preventing others from updating.

No luck with 15.4.1 either, let us see what happens with the next release.

Ditto, it didn’t work for me either. I’ve now gone the nuclear route of wiping the entire drive as I have time machine backups of everything, and would like to get my personal volume fixed. Prior to this I tried a first aid repair via disk utility in the recovery menu as recommended elsewhere but I still am unable to install macOS, either from recovery or USB.

I’ve just had a phone call with apple support who directed me to try wiping the device via the password recovery assistant, and I am currently a reinstallation from recovery which will hopefully be more successful!

Apple support were unable to resolve on the phone after trying another method of erasing the internal drive, so I need to take it in to the Apple Store for a service appointment, device is effectively a paperweight now.

Hi,

I have similar problem on my 14" MacBook Pro M1 Max 2021...

Error message with "panic" message after upgrade to latest Sequoia. So I decided to do full recovery to only available Sequoia.

Recovery started normally, restarts automatically and after reboot it displays dialog to select startup drive. When I select Macintosh HD it says that system must be reinstalled.

I tried erase disk, erase Mac, installation on external SSD with the same result.

Apple support told me that only solution is diagnostic on service center. But I don't think my HW is faulty. It worked fine until latest Sequoia update.

Do anybody make any progress with this issue please? Do you have any information from Apple about it. Do they some inquiries regarding this behaviour?

Thanks