How to Revert iMac from Windows/ChromeOS to Stock macOS

Restoring your iMac to Factory macOS

If your iMac is stuck in a bootloop with Windows or ChromeOS, you need to clear the non-Apple bootloaders and restore the native recovery system.

Restoration Guide:

  1. Clear NVRAM: This is the first step to stop the Windows bootloop. Hold Cmd + Opt + P + R on boot for three chimes.
  2. Internet Recovery: Hold Cmd + Opt + R. This will attempt to load the official Apple recovery over Wi-Fi.
  3. Disk Utility Wipe: Once in Recovery, click 'View' > 'Show All Devices'. Select the top-level drive and click Erase. Format as APFS (or Mac OS Extended if it's an older model).
  4. Reinstall: Select Reinstall macOS. This will install the original OS your Mac shipped with.

Note: Since you don't have another PC, Internet Recovery is your only option. If it fails, you will need to borrow a Mac to create a USB installer.


Original Question: "How do I return my from what was Ventura iMac then a Chrome OS iMac and now a Windows oMac back to stock MacOS?"

How do I return my from what was Ventura iMac then a Chrome OS iMac and now a Windows oMac back to stock MacOS?

Also the drives are very confusing I know I messed up somewhere every restart I need to manually force it to boor in Windows OS otherwise it bootloops.

Anyway I want to return it back to stock OS but no idea how? I don't have access to any other PC. And

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