I rooted my phone with the Samsung Galaxy S III: Full Update Guide
I stumbled when I tried to flash the CyanogenMod. I do not get the install from zip file command while in the ClockworkMod recovery mode. So I can't seem to be able to find the zip file to install the CyanogenMod.
What I am trying to do now is to unroot my S3, but seeing that I rooted it using Heimdall rather than ODIN, is it still safe to unroot using ODIN?