factory reset

Click here and follow the instructions. If the computer originally shipped with Mac OS X 10.6.8 or earlier, when you reach step 6, connect its original install thumbdrive, restart with the C or Option key held down, use the Disk Utility to erase the internal drive, and install a fresh OS.

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swa44 Said:

”factory reset: How do I factory reset my Macbook Air Pro”

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Go Here: How to reinstall macOS from macOS Recovery - Apple Support.

You would reinstall the macOS that came with your Mac, or the closest version still available. Boot up holding down these four buttons simultaneously: [Shift + Option + ⌘ + R]

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For Note:

Backing up your Mac:

Are you Concerned of Losing Data?

• If not, just move ahead and erase the disk and then install the macOS

• If so, back up your Mac: (using Time Machine)

How to Use Time Machine:

Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall.

swa44 Said:

”factory reset: Thanks we will sell the mac once it is factory reset, so data loss is not a concern.”

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You are welcome.