Pretty sure it was originally posted back in July before most of the VM SGS3 phones had the updated (Jelly Bean) bootloader, version MG2. The essence of the guide is still correct, however. Main concern is that you don't really want to mess with flashing other bootloaders due to potential brick issues; current MG2 version works just fine anyway. You will need Odin, most recent .tar file for custom recovery of choice (I always use TWRP) to be pushed onto phone via Odin, and then SuperSU update .zip file to root via flash from custom recovery.
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