Rom upgrade for my phone

Hey all,

I just got this phone as a present from someone while having lost my own. Its a Sky Vega LTE IM-A800s and its a Korean phone (I'm currently in Korea) running Android 2.3.5. However its full with bloatware and uses an annoying pre-installed skin, which I want to get rid of. I have been looking around for the past couple of hours to see if I can get it rooted and install a stock-rom or a custom one but I can't find anything.

Tried to root it through this method but the phone doesn't respond to the .bat files in USB debugging mode.

Thanks for any input!