I reached the recovery mode to install a new copy of macOS 11.4. Started my Imac with 'option' key pressed, choose my USB as startVolume and the boot went well. i made a bootable USB with macOS Big Sur 11.4 installer.

My worst experience with a system update. else i will try a Catalina downgrade and go buy me PC. then i want to try the Target Disc Mode and therefore i have to buy a thunderbolt 3 cable and bring my imac to a friend's place that has Big Sur working. i saw that people did it without losing data. I have also two Volumes, a Macintosh HD (with 57 KB used) and Macintosh HD - Data (with 162 GB used).įor today i will make a bootable USB with macOS 11.4 and try to boot from external drive. If i'm not wrong, before it was in /Volumes/Macintosh HD/Users/MyUser/.

Users/ is now in /system/Volume/Data/Users. My Macintosh HD still showing 169 GB but when i check the file system with terminal i see empty files. i can see it using Terminal in recovery mode. i reinstalled big sur on external drive with 1TB, ended also with error.īut since yesterday my file system changed. and i know it will end with the same error. It shows me at the beginning 2 hours and 19 minutes left than it goes up. i did the Internet recovery many times (opt+cmd+r and shit+opt+cmd+r), but it ends with same error after hours (error applying the software update). Diagnostics gave error PPM002 but i can see my disks on the terminal and in Disk Utility. Safe mode couldn't start, it an endless loop till release the Shift key. and this is what it means: 'A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.' !! and since yesterday when i reboot(normal start) the mac i have a black screen with a prohibition sign.

then 'An error occurred preparing the software update' then 'An error occurred applying the software update in macos big sur' And since one week i had different error:įirst: 'An error occurred while installing the selected updates macos big sur' Since months i have an error while trying to download the update. According to Apple my mac should be ready for the new OS. I'm trying since one week to have a successful installation of macOS Big Sur 11.4 on my Imac late 2015 with Intel i5 processor and 1TB HDD. Image if i loose all my data !!! This will be my last Apple computer and will go back to Windows as they don't have this mountain of issues when they release a 'new SAFE OS update'.

I don't have a TM backup because my external drive, 1TB, is permanently rejected by the mac i don#t know for what reason. To start i'm a music produce since 6 years and i bot my Imac 4 years ago and use it for my production.

Mac os disk utility takes forever