I have a MacBook Pro Mid 2012. Until yesterday it had High Sierra. I tried to update to Catalina with an installer I found online, because the link to the App Store didn't work . The installation brakes up every time though and starts again, once the computer is restarted. I get the Error: -69845: File system verify or repair failed. I had a similar problem once and it was the SATA cable to the hard drive, but I replaced it a couple of months ago, so this time it has to be something else.
Luckily, I have an older copy of the system on an USB stick, so I was a able to boot the MacBook and access the drive. It is locked, so I can´t write on it, but at least I can still backup and save my data.
The question however is, is there something I can do to save the old installation or is it corrupt now, because the update to Catalina overrode some files and there is just nothing I can do to fix that?
Luckily, I have an older copy of the system on an USB stick, so I was a able to boot the MacBook and access the drive. It is locked, so I can´t write on it, but at least I can still backup and save my data.
The question however is, is there something I can do to save the old installation or is it corrupt now, because the update to Catalina overrode some files and there is just nothing I can do to fix that?
