how to fix macos installation failed an error occurred easy guide?

The latest Mac OS is macOS High Sierra.

No, a factory reset does not delete everything. Factory resets remove the user’s personal data and settings, but do not erase any of the factory images or software that are on the device.

To do a factory reset on your iPhone, follow these steps:
From the Home screen, tap Settings.
Tap General.
Tap Reset.
Enter your passcode if required and tap Reset again.

There are a few ways to reinstall OS on your computer.
Use the Windows installation media that came with your computer. This will reinstall the operating system onto your computer.
Use a bootable USB drive to install OS onto your computer. This will allow you to start up your computer from the USB drive, rather than from the installation media.
Use a virtual machine to install OS onto your computer.

There could be a few reasons why your Mac is not updating to Big Sur. One possibility is that your internet connection might not be fast enough to keep up with the heavy download. Another possibility is that you might have an outdated version of the software installed on your Mac. If you’re sure that your internet connection is good and that you have the latest version of the software, then it might be something else on your Mac causing the problem.

macOS 10.13 is no longer available as of September 5, 2019.

There are a few ways to completely wipe your Macbook. You can use a clean install of macOS, you can use a computer with Windows installed, or you can use the built-in erase function in macOS.

To hard boot a Macbook Pro, hold down the power button for 30 seconds.

Boot your Mac from the macOS Recovery System disc or USB drive.
In the Utilities window, select Disk Utility.
If the Macintosh HD is not visible, click on the + button in the bottom left corner of the Disk Utility window and select New Image from Image File.
Select your Macintosh HD in the list on the left and choose Restore from the menu on the right.

Yes, you can reinstall macOS after erasing it. However, you may lose some data that was saved on the hard drive before the erase operation.

To reinstall macOS when startup volume is deleted:
Boot your Mac from the macOS Recovery System (available as a download on the Apple website).
At the login screen, type “reinstall” and press Return.
At the “Reinstall macOS” window, click Continue.
At the “Select a location to install macOS” window, click Install to start the installation process.
5.

If you erased the Macintosh HD, you would lose all your data, applications, and settings.

To factory reset your Macbook Big Sur, first turn it off and disconnect the power cord. Open the computer by pressing the keyboard case release button and lifting the top cover. Remove the battery, SD card, and SIM card. Turn on the computer by plugging in the power cord and pressing the power button. Immediately after turning on, hold down the Option key and press the Delete key. Release both keys when you see the Apple logo.

To install macOS Big Sur, you will need to download the installer from the Apple website and then follow the instructions provided.

There is no definitive answer to this question since Macs can be updated at any time, and the update process is not particularly difficult. However, if your Mac is several years old or older, it may not be able to handle the latest updates from Apple. In that case, you may want to consider buying a new Mac.