How do you mean by "Open part 1"?? I have downloaded the 3 parts, so I need to open the "Part 1" for it to link together? or copy this 3 parts into my internal SD and flash "Part 1" which is it??
Edit: Here is how you do it, first download all the 3 parts, then extract it to Biftor rom v6-JB-XWLSD-No wipe, it will automatically combine the 3 files into 1 installation zip file, copy this new zip file to your internal phone SD and flash it.
Recommended to wipe data factory reset and wipe cache and also go to advance to wipe dalvik cache and battery status then flash the zip from SD, this is for clean installation~