Phone died during a Cyanogen software update last night, apparently getting my Galaxy S3 stuck in a bootloop. After consulting CM's website, I attempted to use Heimdall on Mac to flash a CM ROM. Terminal window will say successful, but there is no "blue loading bar" as said on the CM website. I'm able to get into Download and Recovery modes, but I was stupid and didn't fully understand what creating a recovery means.
Any help is greatly appreciated.