well i don't know is it right to post at here, but i have problem actually. i'm using at K750i with but i wanna apply patch that is not suit for my firmware. can i change my firmware to R1CA021. but i just can download the MAIN is CHINA, and the FS is APAC when i flash both to my mobile, it success. but when i turn it on, it asked me to insert a correct sim card. so i tried to google it and i found that i need to unlock my sim, and i found information at topsony.com as well. after i unlock it, but my mobile can't search the digi network. so what should i do now ?

well did search lots of website and even with some application search. but i can't find the APAC for main. i think the only way to run that firmware is to unlock my phone sim card. but after unlock can't find digi network. so seems to be unless if my phone that can't contact with others