PPCGeeks - Iusacell HTC6800 for update, plz help

Hi Guys, I have a problem in changing the HTC6800 software from Spanish version into English version. Plz help, thx!

I got an HTC6800 customized by a Mexican operator and did not know any Spanish. I wanna update the software but get worried about the change that all the incoming and outcoming calls will become international ones because of the roaming problem after the change, right? How should I handle the update so as to avoid that roaming problem, or actually it is not a problem at all?

BTW, should anybody find the RUU form me? I failed in searing that program. thx!