How to make the MacPro ready for second hand retail without errasing the MOS?
MacBook Pro (13-inch Late 2011)
Posted on Aug 24, 2015 7:06 PM
Q: How to make the MacPro ready for second hand retail without errasing the MOS?
See the Apple guidelines:What to do before selling or giving away your Mac - Apple Support
You need to erase the hard drive and reinstall the original operating system.