Rooting and upgrading software questions - Samsung Galaxy S3 GT-I9300T

I hope this is the correct section to post this. I have a sgs3 GT-I9300T that is/was carrier locked through Vodafone. I say is/was because I can currently use an Optus simcard without problems. This specific model does not support any upgrade past 4.3 jellybean (which is bs lol)

So here I am, a complete phone noob, wondering how to root this specific model and upgrade to at least the 4.4.4 KitKat port ive seen posted. Is there any guides or how tos on the subject? Is there a difference between both GT-I9300 and the T variation in terms of rooting/flashing custom roms etc?

I have a dream to become Pokémon master but my phone is not allowing me to become one. Please help me

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