Hey there,
I compiled some instructions for you below direct from Apple's website.

First, you'll want to boot into Recovery Mode .

Then you'll want to Erase your Mac's startup volume . Be sure to select Mac OS Extended (Journaled) as the volume format, then for security purposes…

Finally ...

Hey there,
I compiled some instructions for you below direct from Apple's website.

First, you'll want to boot into Recovery Mode .

Then you'll want to Erase your Mac's startup volume . Be sure to select Mac OS Extended (Journaled) as the volume format, then for security purposes…

To prevent the ...

I have an old MBP (late 2013) and bought a new one. Now I will sell the old one (still worth around $400). my question is how to safely delete all data on the device?