iMac OS Ventura 13.4.1 fails to prepare update to 13.5.1

Attempting to update from 13.4.1 to macOS Ventura 13.5.1.


Download is ok.

But the upgrade fails at "Preparing update" with no other error messages, just "Failed to prepare the software update. Please try again."

Tried updating with no peripherals connected, reset pram/nvram, and safe mode, allresulting in same error.


Any ideas folks?


Details:


Retina 5K, 27-inch, 2017

3.8 GHz Quad-Core Intel Core i5

Radeon Pro 580 8 GB

40 GB 2400 MHz DDR4


mac OS 13.4.1 (c) (22F770820d)

iMac 27″ 5K

Posted on Sep 4, 2023 11:10 AM

Reply
Question marked as Top-ranking reply

Posted on Sep 4, 2023 02:12 PM

The Go To for that Specific Error message >>


refer below


Excerpt from below link


The message might say that an error occurred while downloading, preparing, or installing, or that the installer is damaged or could not be verified.


If an error occurred while updating or installing macOS - Apple Support


13 replies

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

iMac OS Ventura 13.4.1 fails to prepare update to 13.5.1

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.