Error Code:0xc000000f on Bootup, firmware lock and unable to get to recovery mode.

I am unable tog in and am getting the firmware lock. A previous owner of the Mac, bought a new iphone and for some reason her iCloud was still linked to the MacBook, (but my own iCloud account had been running ont he machine for 2 years), she selected to erase her settings for the device in her iCloud account and the firmware lock arrived. Unable to get into recovery mode, and get the following error (see image) Error Code:0xc000000f. The machine has bootcamp installed and the text and language looks like its Windows recovery mode?? Any help appreciated from the community - thanks