YEA! I have finally done it. i have flash my k750i english into w800i traditional chinese. However, i used the program off www.davinciteam.com and paid 10 euro, its about 台幣 400. it wasn't as hard as i thought. after i have flas it, the usb drive seems to not working. So, i went to sony ericsson.com and down load the w800 usb drive and then i down load se update usb drive. And now everything is working perfectly..
