How to restore Operating System Without a Backup on Mac
I formatted My 2021 I mac. My backup did not work. How can i get a OS system back on my mac
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.13
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The Apple Support Community will permanently close on November 20, 2026. Starting today, the site will no longer accept new posts and is available in a read-only state.
You can continue to find trusted guidance and support on the official Apple Support site.
We want to thank the community members who have contributed their time and expertise to help others with their Apple products.
I formatted My 2021 I mac. My backup did not work. How can i get a OS system back on my mac
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.13
Apparently you completely erased your HD. Time Machine backups do not backup the operating system. You need to reinstall the OS. Hold down the Command + R keys on restart to use the Recovery Mode to do the reinstall. Once completed you can use Migration Assistant to recover your files from the backup. I hope this helps.
Apparently you completely erased your HD. Time Machine backups do not backup the operating system. You need to reinstall the OS. Hold down the Command + R keys on restart to use the Recovery Mode to do the reinstall. Once completed you can use Migration Assistant to recover your files from the backup. I hope this helps.
If you indeed have a 2021 iMac, then you have an Apple Silicon M-series Mac where you will need to perform a DFU firmware Restore using another Mac.
If you have an Intel iMac, then follow the instructions given by @Ronasara.
Thank you
How to restore Operating System Without a Backup on Mac