flashing rom on nexus with a mac!! HELP

[triniqc]

My nexus is rooted. I believe my bootloader is unlocked. A friend of mine rooted my nexus for me, but said he locked the bootloader after he was done?? How do i flash a rom on my nexus using a mac computer?? HELP

 

[Cyber Warrior]

http://forums.androidcentral.com/ve...backup-restore-install-roms-galaxy-nexus.html