Default [Q] SGP311 4.3 Root method ?

Hey guys,
I'm trying to root my SGP311 that was just updated to 4.3, I found this guide,
When it mentions to flash stock again I don't know what to do here, i updated, Where would I get what file?
I dunno what to search for D:

Sorry if my questions are silly, Im still used to the samsung ways of things, fastboot and all this is new to me D:
Current Phone: Samsung Galaxy S4 GT-I9505G GPE ROM Rooted Phillz Touch 6.00.2
Current Tablet: Sony Xperia Tablet Z SGP311
Past phones in order: iPh4, LG KM900 Arena, Nokia 6210 Navigator,2x Unknown Nokia, Motorola Razr V3, The Simpsons Phone.
Paradox Inc.
A lot is known about me in this place, "Internet" And some day, I hope to reside here along with all the data.