Reset Phone In Settings - Now Won't Boot

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http://forum.xda-developers.com – Hello, I was going to sell my phone to a friend today. I was running CWM recovery and paranoid android ICS. Anyways, I simply went to settings --- > factory reset ---> checked "wipe sd card" and hit OK. Now it won't boot. It'll go to the Galaxy S II screen and shutoff. It boot loops while trying to boot into recovery mode. I can, however, get it into download mode. I was looking at guides on here on how to reset it and are confused as can be. Where can I download Heimdall (yes, I googled it, couldn't find the download on their site.) I'm on Mac OS X, if that helps, (HowTos)