Q: I am unable to factory reset my late 2011 macbook pro 13 inch

MrSantana,

do you have access to a FireWire cable and a second Mac with a FireWire port? If so, you could boot your MacBook Pro into Target Disk mode so that it will be treated as an external hard disk by the second Mac. You could then run Disk Utility on the second Mac to completely erase your MacBook Pro’s internal hard disk, after which you can boot your MacBook Pro into OS X Internet Recovery to factory reset it.

MrSantana,

OS X Internet Recovery will always restore your MacBook Pro’s originally installed version of OS X — for a Late 2011 model, that would be Lion. Once Lion has been reïnstalled, you could then upgrade to whichever subsequently released version of OS X you’d prefer.

Start the MBP with the OPTION+COMMAND+R keys.  That should result in a display with a revolving globe.  This will access the Apple servers and download the original OSX for the MBP.  You will need a solid Internet connection.

Ciao.

MrSantana,

see my Target Disk mode reply above.