I bought a 2019 refurbished imac with the Big Sur OS installed from MacSales and I'm trying to upgrade to the latest OS. I've tried installing all OS from Monterey to Sonoma with no luck. The OS installer downloads and installs with no errors, but when I check About This Mac it still shows the Big Sur OS. I have plenty of space (about 150G) and a strong internet connection. Any clues would be greatly appreciated.
iMac 21.5″, macOS 11.7
You're welcome.
You might also want to double check the year model to make sure that you received a 2019 and not a 2017 iMac model that can only run up to Ventura. see > Identify your iMac model - Apple Support
And yes, sometimes it helps to trash an App Store Installer and replace it with a new one.
Also don't forget to reach out to OWC MacSales for additional support at > https://eshop.macsales.com/Service/
Are you trying to update using Software Update or by downloading from the App Store?
see > Update macOS on Mac - Apple Support
App Store downloads go to your Applications folder and must be opened and installed from there.
If you are seeing an error while updating, try updating while in Safe Mode.
see > If an error occurred while updating or installing macOS - Apple Support
Yea' OWC MacSales is reliable, but it doesn't hurt to double check the year model.
Let us know what they have to say.
Don't be surprised if they suggest a Backup, then an Erase and Re-Install.
Thanks for the reply. I've tried both software update and downloading from app store - no luck. No error while downloading or installing. I have tried in safe mode as well with the same result, error free download and install but no change of OS when I check About This Mac. I'll trash the Sonoma install in my applications folder and download a new one from the app store.
About This Mac says its a 2019 and the same thing happens while trying to install Monterey or Ventura. Thank you for the MacSales link, I will give them another try.
2019 Imac refurb upgrade from Big Sur
