Default [Q] sony is12s convert to lt26w international

first of all this is my first time here and sorry for my poor english.

i have a sony is12s(acro hd) phone.but because it has so many japanese apps and its camera quality is very poor.i searched this and found some posts regarding the custom roms i want to convert this to the original sony acro s rom so that i can avoid these apps and have better performance on my phone.i tried searching the web but its filled with many japanese sites that i cant understand any of.i am looking for someone who can help me with a guide with some links and and few screenshots because i am new to this.any comment or any post is highly appreciated.thanks in advance