Judging by your previous posts, it sounds like your phone has been rooted, and you installed a custom ROM. If that's the case, you probably won't be able to get an official OTA system update.
Ok, then is your friend's phone unrooted? What carrier is it on, and is the phone originally from that carrier, or was it unlocked from some other carrier?
Actually Its D858hk but he bought it from Bangladesh from a user as 2nd hand. He told us its unlocked. And we found Its supporting every network in Bangladesh but only problem with OTA.